Answer: exothermic
Explanation: It is a combustion reaction with methane.
The given chemical equation is representing the exothermic type of reaction. Therefore, option (C) is correct.
What is an exothermic process?An exothermic process can be demonstrated as a thermodynamic reaction that emits energy from the system to its surroundings, generally in the form of heat, light, or sound.
While an endothermic process is defined as an opposite of an exothermic process where the heat gets energy in the form of heat. The chemical bond energy in chemical reactions is transformed into thermal energy.
In exothermic reactions, the change in the kinetic energy of molecules when the heat is liberated. The electronic transition from one energy level to another causes light to be released.
The combustion reaction is the exothermic reaction therefore, the combustion of methane liberates heat along with carbon dioxide and water. When methane reacts with oxygen gas, it produces energy along with the other products of the combustion reaction.
Learn more about the exothermic process, here:
brainly.com/question/12321421
#SPJ5
A gas occupies 49 liters at a pressure of 367 mm Hg. What is the volume when the pressure is increased to 784 mm Hg?
Answer:
22.94 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have two different values of V and P:
P₁V₁ = P₂V₂
P₁ = 367.0 mm Hg, V₁ = 49.0 L.
P₂ = 784.0 mm Hg, V₂ = ??? L.
∴ V₂ = P₁V₁/P₂ = (367.0 mm Hg)(49.0 L)/(784.0 mm Hg) = 22.94 L.
A half life of cobalt is 5.27years. Approximately how much a 399 g sample will remain after 20 years?
Answer:
= 28.745 g
Explanation:
Half life is the time taken by a radioactive element to decay by half the original amount.
Therefore;
New mass = Original mass × (1/2)^n
Where n is the number of half lives, in this case, n = 20/5.27 = 3.795
Therefore;
New mass = 399 g × (1/2)^3.795
= 28.745 g
PLEASE HELP ASAP!!!!!!
In your own words, describe the connection between the heat from earth’s core and the movement of tectonic plates.
The immensely strong heat creates conviction cells to create movement as it follows the currents.
Final answer:
Heat from Earth's core causes convection currents in the mantle, driving the movement of tectonic plates. This movement can create divergent and convergent plate boundaries, leading to the formation of new lithosphere, mountain ranges, earthquakes, and volcanic activity.
Explanation:
The core of the Earth is extremely hot, and this heat plays a crucial role in the movement of tectonic plates that make up the planet's crust and upper mantle. The process of heat transfer from the core to the mantle is known as convection. In this process, warmer material rises due to being less dense, and cooler material sinks because it is denser. This continuous cycle of rising and sinking material creates convection currents in the mantle.
These convection currents are the primary driving force behind the movement of tectonic plates. At divergent boundaries, where two plates are moving apart, new lithosphere forms at ocean ridges due to upwelling currents. Conversely, at convergent boundaries, where plates move toward each other, one plate can be forced under another in a process called subduction, which can lead to the formation of mountains, earthquakes, and volcanic activity. Therefore, the heat from Earth's core is essential in driving the dynamic processes that shape the planet's surface.
Mitochondria _
Plant
Answer:
??????
Explanation:
I believe this question is asking what a mitochondria does for a plant cell?
The mitochondria is the digestive system in a plant cell. It’s job is to take in nutrients, break it down, and then create energy from it. The mitochondria is a crucial part of cellular respiration.
What is the purpose of graphics in scientific articles
Answer:
Graphics can sometimes convey more information in a brief amount of space than an author can explain in a paragraph.
Which type of solid has the lowest and highest melting point?
lowest melting point-covalent solids
highest melting point-ionic solids
Molecular solids like ice tend to have lower melting points due to weaker intermolecular forces, while ionic solids such as sodium chloride have high melting points due to strong ionic bonds. Network covalent solids also have high melting points, whereas amorphous solids soften over a range of temperatures.
Explanation:The melting point of a solid is the temperature at which the solid changes into a liquid. It reflects how much kinetic energy is required for the particles within a solid to overcome the attractive forces keeping them in place. In general, molecular solids, such as ice (melting point of 0°C), tend to have lower melting points due to weaker intermolecular forces like hydrogen bonds or London dispersion forces. On the other hand, ionic solids, such as sodium chloride (melting point of 801°C), display the highest melting points because the ionic bonds between their ions are very strong.
Network covalent solids often have high melting points as well since the atoms within the network are bonded by covalent bonds that require significant energy to break. By contrast, amorphous solids like butter do not have a sharp melting point but rather soften over a range of temperatures due to the lack of a well-ordered molecular structure like that seen in crystalline solids.
Calculate Delta H in KJ for the following reactions using heats of formation:
a) 2C2H6 (g) + 7O2 (g) ---> 4CO2 (g) +6H2O (g)
b) 2PbO (s) + PbO2 (s) ---> Pb3O4 (s)
Answer:
(a)[tex]\Delta H\textdegree = -2856.8\;\text{kJ}[/tex] per mole reaction.
(b)[tex]\Delta H\textdegree = -22.3\;\text{kJ}[/tex] per mole reaction.
Explanation:
What is the standard enthalpy of formation [tex]\Delta H_f\textdegree{}[/tex] of a substance? [tex]\Delta H_f\textdegree{}[/tex] the enthalpy change when one mole of the substance is formed from the most stable allotrope of its elements under standard conditions.
Naturally, [tex]\Delta H_f\textdegree{} = 0[/tex] for the most stable allotrope of each element under standard conditions. For example, oxygen [tex]\text{O}_2[/tex] (not ozone [tex]\text{O}_3[/tex]) is the most stable allotrope of oxygen. Also, under STP [tex]\text{O}_2[/tex] is a gas. Forming [tex]\text{O}_2\;(g)[/tex] from itself does not involve any chemical or physical change. As a result, [tex]\Delta H_f\textdegree{} = 0[/tex] for [tex]\text{O}_2\;(g)[/tex].
Look up standard enthalpy of formation [tex]\Delta H_f\textdegree{}[/tex] data for the rest of the species. In case one or more values are not available from your school, here are the published ones. Note the state symbols of the compounds (water/steam [tex]\text{H}_2\text{O}[/tex] in particular) and the sign of the enthalpy changes.
[tex]\text{C}_2\text{H}_6\;(g)[/tex]: [tex]-84.0\;\text{kJ}\cdot\text{mol}^{-1}[/tex];[tex]\text{CO}_2\;(g)[/tex]: [tex]-393.5\;\text{kJ}\cdot\text{mol}^{-1}[/tex];[tex]\text{H}_2\text{O}\;{\bf (g)}[/tex]: [tex]-241.8\;\text{kJ}\cdot\text{mol}^{-1}[/tex];[tex]\text{PbO}\;(s)[/tex]: [tex]-217.9\;\text{kJ}\cdot\text{mol}^{-1}[/tex];[tex]\text{PbO}_2\;(s)[/tex]: [tex]-276.6\;\text{kJ}\cdot\text{mol}^{-1}[/tex];[tex]\text{Pb}_3\text{O}_4\;(s)[/tex]: [tex]-734.7\;\text{kJ}\cdot\text{mol}^{-1}[/tex]How to calculate the enthalpy change of a reaction [tex]\Delta H_\text{rxn}[/tex] (or simply [tex]\Delta H[/tex] from enthalpies of formation?
Multiply the enthalpy of formation of each product by its coefficient in the equation.Find the sum of these values. Label the sum [tex]\Sigma (n\cdot \Delta_f(\text{Reactants}))[/tex] to show that this value takes the coefficients into account.Multiply the enthalpy of formation of each reactant by its coefficient in the equation.Find the sum of these values. Label the sum [tex]\Sigma (n\cdot \Delta_f(\text{Products}))[/tex] to show that this value takes the coefficient into account.Change = Final - Initial. So is the case with enthalpy changes. [tex]\Delta H_\text{rxn} = \Sigma (n\cdot \Delta_f(\textbf{Products})) - \Sigma (n\cdot \Delta_f(\textbf{Reactants}))[/tex].For the first reaction:
[tex]\Sigma (n\cdot \Delta_f(\text{Reactants})) = 4\times (-393.5) + 6\times (-241.8) = -3024.8\;\text{kJ}\cdot\text{mol}^{-1}[/tex];[tex]\Sigma (n\cdot \Delta_f(\text{Products})) = 2\times (-84.0) + 7\times 0 = -168.0\;\text{kJ}\cdot\text{mol}^{-1}[/tex];[tex]\begin{aligned}\Delta H_\text{rxn} &= \Sigma (n\cdot \Delta_f(\textbf{Products})) - \Sigma (n\cdot \Delta_f(\textbf{Reactants}))\\ &= (-3024.8\;\text{kJ}\cdot\text{mol}^{-1}) - (-168.0\;\text{kJ}\cdot\text{mol}^{-1})\\ &= -2856.8\;\text{kJ}\cdot\text{mol}^{-1} \end{aligned}[/tex].Try these steps for the second reaction:
[tex]\Delta H_\text{rxn} = -22.3\;\text{kJ}\cdot\text{mol}^{-1}[/tex].
Which half-reaction correctly describes an oxidation?
Answer:
The last choice is oxidation.
Explanation:
The this is a reaction in which the oxidation number of chromium metal
( 0 ) goes the an oxidation number of 3 in Cr3+.
Answer : The correct option is, [tex]Cr(s)\rightarrow Cr^{3+}(aq)+3e^-[/tex]
Explanation :
Redox reaction : It is a reaction in which the oxidation and reduction reaction takes place simultaneously.
Oxidation reaction : It is a reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.
Reduction reaction : It is a reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.
The correct oxidation-half reaction will be :
[tex]Cr(s)\rightarrow Cr^{3+}(aq)+3e^-[/tex]
In this half oxidation reaction, the oxidation state of 'Cr' changes from (0) to (+3) that means the oxidation state increases that means it shows oxidation.
Use this diagram to determine which of the following statements is true.
Answer:
D. Catalysts speed up the rate of reactions by lowering the amount of energy required for the reaction to proceed.
Explanation:
A catalyst is a substance that:
speeds up the rate of a reaction .does not alter the products of the reaction .is unchanged chemically and in mass at the end of the reaction.A catalyst provides an alternative reaction pathway that has a lower activation energy than the uncatalyzed reaction.
The figure shows how the energy of the reactants and products change during a reaction.
At 0°C, frozen water (ice) changes to liquid water. When an ice cube is placed on something that is warmer than it, heat will move from the warmer substance to the water until
A.
both objects are the same temperature.
B.
the ice melts.
C.
the ice reaches 0°C.
D.
the warmer substance cools to 0°C.
Answer:hi guys it is both objects are the same temperature
Explanation:
Heat transfers from a warmer object to a colder one (such as an ice cube) until both objects are at the same temperature. This is a process known as conduction.
Explanation:When an ice cube is placed on an object that is warmer than it, heat will be transferred from the warmer substance to the ice cube. This process will continue until both objects are the same temperature. This is explained by the physics law of heat transfer, specifically conduction, which is the process where heat energy is transferred between substances in direct contact with each other.
The warmer object will lose heat to the colder object (the ice cube) until equilibrium is reached and both objects have the same temperature. It may also coincide with other options like the ice melting or ice reaching 0°C, but this depends on the initial temperature of the warmer object.
Learn more about Heat Transfer here:https://brainly.com/question/13433948
#SPJ3
When electrons are removed from an atom, the atom becomes positively charged and is referred to as a(n) _____.
anion
anode
cation
cathode
Answer:
cation.
Explanation:
A cation is an ionic species with a positive charge. The word "cation" comes from the Greek word "kato," which means "down." A cation has more protons than electrons, giving it a net positive charge.So, when electrons are removed from an atom, the atom becomes positively charged and is referred to as a cation.Does it make a difference if the jar is square or round? What about the size of the jar or glass?
It’s talking about refraction*
no it doesn't make differance at all ...only the material used make difference
What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 4.6?
Answer: 2.5 × 10⁻⁵ M H₃O⁺ and 4.0 × 10⁻¹⁰ M OH⁻
Explanation:
∵ pH = - log[H₃O⁺]
∴ 4.6 = - log[H₃O⁺].
∴ log[H₃O⁺] = - 4.6.
∴ [H₃O⁺] = 2.51 x 10⁻⁵.
∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
[H₃O⁺] = 2.51 x 10⁻⁵ M.
∴ [OH⁻] = 10⁻¹⁴/[H₃O⁺] = 10⁻¹⁴/(2.51 x 10⁻⁵ M) = 3.98 × 10⁻¹⁰ M ≅ 4.0 × 10⁻¹⁰ M.
Answer : The concentration of hydroxide and hydronium ion is, [tex]3.9\times 10^{-10}M[/tex] and [tex]2.5\times 10^{-5}M[/tex]
Explanation: Given,
pH = 4.6
pH : It is defined as the negative logarithm of hydrogen ion and hydronium ion concentration.
[tex]pH=-\log [H_3O^+][/tex]
First we have to calculate the [tex]H^+[/tex] concentration.
[tex]pH=-\log [H_3O^+][/tex]
[tex]4.6=-\log [H_3O^+][/tex]
[tex][H_3O^+]=2.5\times 10^{-5}M[/tex]
Now we have to calculate the pOH.
[tex]pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-4.6=9.4[/tex]
Now we have to calculate the [tex]OH^-[/tex] concentration.
[tex]pOH=-\log [OH^-][/tex]
[tex]9.4=-\log [OH^-][/tex]
[tex][OH^-]=3.9\times 10^{-10}M[/tex]
Therefore, the concentration of hydroxide and hydronium ion is, [tex]3.9\times 10^{-10}M[/tex] and [tex]2.5\times 10^{-5}M[/tex]
1. scientists can use rock layers to determine which of the following?
A. The mass of Earth
B. The size of Earth
C. The age of Earth
D. The amount of land on Earth
2. Fossils in ________ layers of rock are generally estimated to be ______ than fossils found in the deeper layers.
A. older, younger
B. newer, younger
C. older, older
D. newer, older
3. New evidence can lead to a change in scientific knowledge
true or false
Answer:1. Age of earth 2. D. Newer, Older 3. True
Explanation:
Scientists use rock layers to determine the age of Earth. Fossils in newer, or higher, rock layers are typically younger than those in older or deeper layers. And yes, new evidence can indeed lead to changes in scientific understanding.
Explanation:1. Scientists use rock layers primarily to determine the age of Earth. They do this through a method called stratigraphy, wherein they study the arrangement of rock layers and relative ages to understand the Earth's past. So, the correct answer is C. The age of Earth.
2. Generally, fossils found in newer layers of rock are estimated to be younger than those found in deeper (or older) layers. As sediment is deposited over time, newer layers form on top of older ones, and as a result, newer fossils are typically found closer to the surface. So the correct answer is B. newer, younger.
3. True. New evidence can definitely lead to a change in scientific knowledge. Science is a dynamic and evolving field and new discoveries or data can modify or even completely change previously held theories and understandings.
Learn more about Rock layers and Fossils here:https://brainly.com/question/7357093
#SPJ3
What is the mass of one mole of S8?
Answer:
256.52 g/m
Explanation:
Each S has a molecular mass of 32.056 g/mol so multiply that by 8 and you get 256.52.
Which of the following is an example of cell division at work?
A.
A muscle contracts.
B.
A dog digests food.
C.
A tree grows taller.
D.
A plant dies.
Answer:
C-a tree grows taller
Explanation:
Cell division is cellular reproduction, so C is the only option involving growth/reproducing.
Answer:
The correct answer to this question is: C "A Tree Grows Taller"
Explanation:
Cell division is cellular reproduction. All mammals eat to take in energy. Plants take in energy from the sun to use and collect the same energy which is then used to do various things. The tree is using Mitosis to its advantage so it can grow. That is why C is the correct answer.
Hope this helped have an amazing day!
Caffeine has the following percent composition: carbon 49.48%, hydrogen 5.19%, oxygen 16.48% and nitrogen 28.85%. Its molecular weight is 194.19 g/mol. What is its molecular formula?
Here is the solution hope u understand
The empirical formula mass of the compound is calculated to be 97 g. Thus, molecular formula of compound is C₈H₁₀O₂N₄.
What is empirical formula?Empirical formula of a compound is derived from the mole ratio of each element in the compound. The molecular formula of the compound can be obtained by multiplying the empirical formula with the integer calculated by dividing the molecular mass by formula mass.
Given 49.48 % of C means 49.48 g in 100 g = 49.48/12= 4.12 moles
mass of oxygen = 16 g/mol
moles in 16.48 g = 16.48.=/ 16 = 1.03 moles.
mass of H = 1 g/mol, moles in 5.19 = 5.19 moles.
mass of nitrogen = 14 g/mol, moles in 28.85 g = 28.85/14 = 2.06 moles.
Divide each numbers with the least number among them that is by 1.03, we get the ratios 4: 5: 1: 2. for C, H, O and N respectively.
The empirical formula mass = (4 × 12) + 5 + 16 +( 14×2 ) = 97 g
divide the molecular mass by 97: 194.19 /97 = 2.
Now, multiply the empirical molar ratio by 2 we get 8: 10 : 2:4.
Therefore, the molecular formula of the compound is C₈H₁₀O₂N₄.
To find more on molecular formula, refer here:
https://brainly.com/question/28647690
#SPJ2
Fill in the blank
you can find the run by subtracting the ________ -coordinate of the left point from that of the right point
you can find the run by subtracting the X coordinate of the left point from that of the right point
You can find by subtracting the variable
The point at which a stream empties into another body of water is the _____ of the stream
The mouth (can also be a delta or estuary) is where a stream empties into another body of water.
Answer:
The given blank can be filled with mouth.
Explanation:
A body of water comprising surface water flowing within the banks and bed of a channel is known as a stream. The stream comprises groundwater and surface fluxes, which reacts towards the geomorphological, geological, biotic, and hydrological controls. The lengthy and large streams are generally termed as rivers. The mouth of the stream is considered as the point at which the stream releases probably through a delta or an estuary, into a standing water body like ocean or lake.
Sound waves with a large distance between A and B would be sound waves that have a large ________ and produce loud sounds.
A) amplitude
B) frequency
C) pitch
D) resonance
Answer:
Amplitude
Explanation:
Answer:
a. amplitude
Explanation:
A large C would indicate a large amplitude and a loud sound. When the amplitude increases in a compression wave, there is an increase in the density of the medium, and in the pressure exerted by the particles.
The pH of a solution is 4.36. What is the pOH?
Answer:
9.64
Explanation:
pH + pOH = 14
Since pOH = 4.36, pH would be:
pH = 14 - pOH
pH = 14 - 4.36
pH = 9.64
The answer is 9.46
9.46 pOH
How many grams of antifreeze C2H4(OH)2 would be required per 500 g of water to prevent the water from freezing at a temperature of -20.0 C
Answer:
333.7 g.
Explanation:
The depression in freezing point of water (ΔTf) due to adding a solute to it is given by: ΔTf = Kf.m.Where, ΔTf is the depression in water freezing point (ΔTf = 20.0°C).
Kf is the molal freezing point depression constant of the solvent (Kf = 1.86 °C/m).
m is the molality of the solution.
∴ m = ΔTf/Kf = (20.0°C)/(1.86 °C/m) = 10.75 m.
molaity (m) is the no. of moles of solute per kg of the solvent.
∵ m = (no. of moles of antifreeze C₂H₄(OH)₂)/(mass of water (kg))
∴ no. of moles of antifreeze C₂H₄(OH)₂ = (m)(mass of water (kg)) = (10.75 m)(0.5 kg) = 5.376 mol.
∵ no. of moles = mass/molar mass.
∴ mass of antifreeze C₂H₄(OH)₂ = no. of moles x molar mass = (5.376 mol)(62.07 g/mol) = 333.7 g.
To prevent 500 g of water from freezing at -20.0°C, 333.86 grams of antifreeze [tex](C_2H_4(OH)_2)[/tex] are required. The calculation involves using the freezing point depression formula and converting the molality to grams. Ethylene glycol is the active component in this antifreeze scenario.
To determine how many grams of antifreeze[tex](C_2H_4(OH)_2)[/tex] are required to prevent 500 g of water from freezing at -20.0°C, we can use the freezing point depression formula [tex]\triangle T_f = i mK_f .[/tex]
Here, Δ[tex]T_f[/tex] is the freezing point depression, [tex]K_f[/tex] is the cryoscopic constant for water, and m is the molality of the solution. The constant i is the van 't Hoff factor, which is 1 for ethylene glycol because it does not dissociate in water.
Step-by-Step Explanation:Calculate the required freezing point depression:
Δ[tex]T_f[/tex] = [tex]T_f[/tex] (pure solvent) - [tex]T_f[/tex](solution) = 0°C - (-20.0°C) = 20.0°C
Use the freezing point depression formula to calculate molality:
[tex]\triangle T_f = i mK_f .[/tex]
20.0°C = 1.86°C/m * m
m = 20.0°C / 1.86°C/m = 10.75 m
Calculate the moles of antifreeze required:
molality (m) = moles of solute / kg of solvent
10.75 m = moles of [tex](C_2H_4(OH)_2)[/tex] / 0.5 kg
moles of [tex](C_2H_4(OH)_2)[/tex] = 10.75 m * 0.5 kg = 5.375 moles
Convert moles to grams using the molar mass of [tex](C_2H_4(OH)_2)[/tex] (62.07 g/mol):
grams of [tex](C_2H_4(OH)_2)[/tex] = moles * molar mass = 5.375 moles * 62.07 g/mol = 333.86 g
Therefore, 333.86 grams of antifreeze [tex](C_2H_4(OH)_2)[/tex] are needed for 500 g of water to prevent it from freezing at -20.0°C.
A sample of glucose ( C6H12O6 ) of mass 8.44 grams is dissolved in 2.11 kg water. What is the freezing point of this solution? The freezing point depression constant, Kf , for water is 1.86 °C/mol. (Round your answer to the nearest thousandth)
Answer:
- 0.0413°C ≅ - 0.041°C (nearest thousands).
Explanation:
Adding solute to water causes the depression of the freezing point.We have the relation:ΔTf = Kf.m,
Where,
ΔTf is the change in the freezing point.
Kf is the freezing point depression constant (Kf = 1.86 °C/m).
m is the molality of the solution.
Molality is the no. of moles of solute per kg of the solution.
no. of moles of solute (glucose) = mass/molar mass = (8.44 g)/(180.156 g/mol) = 0.04685 mol.∴ molality (m) = no. of moles of solute/kg of solvent = (0.04685 mol)/(2.11 kg) = 0.0222 m.
∴ ΔTf = Kf.m = (1.86 °C/m)(0.0222 m) = 0.0413°C.
∴ The freezing point of the solution = the freezing point of water - ΔTf = 0.0°C - 0.0413°C = - 0.0413°C ≅ - 0.041°C (nearest thousands).
Answer:
-0.041
Explanation:
The molecular mass of the compound is 137.32 g/mol. What is the molecular formula of the compound?
barium , atomic number 56
Although given the molecular mass of a compound, additional information, most notably the empirical formula, is needed to determine the molecular formula.
Explanation:To determine the molecular formula of a compound with a molecular mass of 137.32 g/mol, we need additional information, specifically the empirical formula of the compound. The molecular formula is a multiple of the empirical formula, and the multiple is determined by the ratio of the molecular mass to the empirical formula mass.
For example, suppose the empirical formula is CH (which has an empirical formula mass of about 13 g/mol for C and 1 g/mol for H). If the molecular mass is 137.32 g/mol, we would divide the molecular mass by the empirical formula mass (137.32/14), which is about 9.8. This isn't a whole number, so we'd need to adjust the empirical formula. But if the empirical formula is C2H2 (with empirical formula mass of 26 g/mol), then the divisor would be 5.3, again not a whole number. Without knowing the empirical formula, we can't determine the molecular formula.
Learn more about Molecular Formula here:https://brainly.com/question/28647690
#SPJ12
A solution was prepared by mixing 50.0 g
MgSO4
and 1000.0 mL water at 25.0°C. The density of the water at this temperature is 0.997 g/mL. What is the percent mass of
MgSO4
in this solution? (Round your answer to the nearest hundredth.)
Answer:
4.78 %.
Explanation:
mass percent is the ratio of the mass of the solute to the mass of the solution multiplied by 100.
mass % = (mass of solute/mass of solution) x 100.
mass of MgSO₄ = 50.0 g,
mass of water = d.V = (0.997 g/mL)(1000.0 mL) = 997.0 g.
mass of the solution = mass of water + mass of MgSO₄ = 997.0 g + 50.0 g = 1047.0 g.
∴ mass % = (mass of solute/mass of solution) x 100 = (50.0 g/1047.0 g) x 100 = 4.776 % ≅ 4.78 %.
The percent mass of [tex]MgSO_4[/tex] in the solution is approximately [tex]4.77\%[/tex].
To find the percent mass of [tex]MgSO_4[/tex] in the solution, we need to calculate the total mass of the solution and then determine the mass of [tex]MgSO_4[/tex] in it.
Given:
[tex]Mass \ of \ MgSO_4 = 50.0 \ g[/tex]
[tex]Volume \ of \ water = 1000.0\ mL[/tex]
[tex]Density\ of\ water = 0.997 \ g/mL[/tex]
First, we'll find the mass of the water using its density:
[tex]\[ \text{Mass of water} = \text{Density} \times \text{Volume} \][/tex]
[tex]\[ \text{Mass of water} = 0.997 \, \text{g/mL} \times 1000.0 \, \text{mL} \][/tex]
[tex]\[ \text{Mass of water} = 997 \, \text{g} \][/tex]
Now, we'll calculate the total mass of the solution:
[tex]\[ \text{Total mass of solution} = \text{Mass of MgSO}_4 + \text{Mass of water} \][/tex]
[tex]\[ \text{Total mass of solution} = 50.0 \, \text{g} + 997 \, \text{g} \][/tex]
[tex]\[ \text{Total mass of solution} = 1047 \, \text{g} \][/tex]
Next, we'll determine the percent mass of [tex]MgSO_4[/tex] in the solution:
[tex]\[ \text{Percent mass of MgSO}_4 = \left( \frac{\text{Mass of MgSO}_4}{\text{Total mass of solution}} \right) \times 100\% \][/tex]
[tex]\[ \text{Percent mass of MgSO}_4 = \left( \frac{50.0 \, \text{g}}{1047 \, \text{g}} \right) \times 100\% \][/tex]
[tex]\[ \text{Percent mass of MgSO}_4 = 4.77\% \][/tex]
Water’s molar mass is 18.01 g/mol. The molar mass of glycerol is 92.09 g/mol. At 25°C, glycerol is more viscous than water. Which substance has the stronger intermolecular attraction?
Answer:
glycerol because it is more viscous and has a larger molar mass than water.
Explanation:
Viscosity depends on inter-molecular interactions.
The predominant inter-molecular force in water and glycerol is hydrogen bonding.
Hydrogen bond is an electrostatic attraction between two polar groups in which one group has hydrogen atom (H) and another group has highly electronegative atom such as nitrogen (like in this molecule), oxygen (O) or fluorine (F).
Final answer:
Water has stronger intermolecular attraction compared to glycerol because water has extensive hydrogen bonding. Hydrogen bonding is a strong intermolecular force that occurs when a hydrogen atom is bonded to a highly electronegative atom like oxygen or nitrogen. Glycerol, on the other hand, does not have hydrogen bonding.
Explanation:
The intermolecular attractions or forces between molecules determine the strength of the attractive forces in a substance. In this case, water has stronger intermolecular attraction compared to glycerol because water has extensive hydrogen bonding. Hydrogen bonding is a strong intermolecular force that occurs when a hydrogen atom is bonded to a highly electronegative atom like oxygen or nitrogen. Glycerol, on the other hand, does not have hydrogen bonding.
Water's molar mass is 18.01 g/mol and it can form hydrogen bonds, which makes it highly cohesive and viscous. Glycerol's molar mass is 92.09 g/mol and it does not have the ability to form hydrogen bonds. Therefore, water has stronger intermolecular attractions due to hydrogen bonding, resulting in its higher viscosity compared to glycerol.
The table shows the concentration of a reactant in the reaction mixture over a period of time.
Reactant Concentration
Time Concentration
0 s 1.8 M
210 s 1.2 M
450 s 0.8 M
580 s 0.6 M
720 s 0.4 M
What is the average rate of the reaction over the first 580 seconds?
A. 1.6 × 10−3
B. 1.9 × 10−3
C. 2.0 × 10−3
D. 2.2 × 10−3
The average rate of the reaction over the first 580 seconds is approximately [tex]2.07 \times 10^{(-3)} M/s[/tex]. Thus, option C is correct.
To find the average rate of the reaction over the first 580 seconds, we can use the formula:
[tex]\[ \text{Average rate} = \frac{\text{Change in concentration}}{\text{Change in time}} \][/tex]
Given the concentrations at 0 s and 580 s, and the corresponding times, we can calculate the change in concentration and change in time:
Change in concentration = 1.8 M - 0.6 M = 1.2 M
Change in time = 580 s - 0 s = 580 s
Now, we can calculate the average rate:
Average rate = [tex]\(\frac{1.2 \text{ M}}{580 \text{ s}}\)[/tex]
Average rate = [tex]\(2.07 \times 10^{-3}\) M/s[/tex]
Therefore, the average rate of the reaction over the first 580 seconds is approximately [tex]2.07 \times 10^{(-3)} M/s[/tex]. Since this is closest to option C [tex](2.0 \times 10^{(-3)})[/tex], the answer is C.
What causes an electric current in a wire?
A) Electrons move because of heat
B) Electrons build up in the wire and create a charge
C) Electric fields cause atoms to move in the wire
D) Electrons flow because of electrical attraction and repulsion
Thank you :3
flow of charge of electrons cause current in wire.
Electric current in a wire causes an electrons flow because of electrical attraction and repulsion. Option D is correct.
Electric current is the flow of electrons through a conductor. Conductors are materials that allow electrons to flow freely. Wires are made of conductors, such as copper or aluminum. When a voltage difference is applied to a wire, it creates an electric field. The electric field causes the electrons in the wire to move.
The electrons move from the negative side of the voltage source to the positive side. The movement of electrons through a wire is what creates an electric current. The amount of current that flows through a wire depends on the strength of the electric field and the resistance of the wire. Electrons are negatively charged particles that orbit the nucleus of an atom. Option D is correct.
To know more about the Electric current, here
https://brainly.com/question/30472333
#SPJ6
a solution has a pH of 5.4. write the formula you will use to calculate the (H+)
Answer:
3.981 x 10⁻⁶.
Explanation:
∵ pH = - log[H⁺]
∴ 5.4 = - log[H⁺]
∴ log[H⁺] = - 5.4
∴ [H⁺] = 3.981 x 10⁻⁶.
Answer:
pH = - log[H⁺]
=> 3.981 x 10⁻⁶
Explanation:
If a gas at 25.0 degrees Celsius occupies 7.20 liters at a pressure of 1.00 atm, what will be its volume at a pressure of 2.50 atm?
Answer:
2.88 L.
Explanation:
To calculate the no. of moles of a gas, we can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant.
T is the temperature of the gas in K.
If n and T is constant, and have two different values of (P and V):P₁V₁ = P₂V₂
P₁ = 1.0 atm, V₁ = 7.2 L.
P₂ = 2.5 atm, V₂ = ??? L.
∴ V₂ = P₁V₁/P₂ = (1.0 atm)(7.2 L)/(2.5 atm) = 2.88 L.