PLS HELP: CHEMISTRY
How many C8H18 molecules are in 0.83 mL of
C8H18, the mass of which is 0.68 g?
Answer in units of molec.

Answer:

2 NH3 + 2 Na = 2 NaNH2 + H2

Explanation:

Answer:

2NH3 + 2Na —> 2NaNH2 + H2

Explanation:

NH3 + Na —> NaNH2 + H2

The above can be balance by doing the following:

There are a total of 4 hydrogen atoms on the right and 3 atoms on the left. This can be balance by putting 2 in front of NH3 and 2 in front of NaNH2 as shown below:

2NH3 + Na —> 2NaNH2 + H2

There are 2 atoms of Na on the right and 1 atom on the left. It can be balance by putting 2 in front of Na as shown below

2NH3 + 2Na —> 2NaNH2 + H2

Now we can see that the equation is balanced as we have equal numbers of atoms of the different elements on both sides of the equation.

Answer:

2.00 M

Explanation:

Final answer:

To calculate the number of moles of CO2 present in 11 grams of CO2, divide the mass of CO2 by the molar mass of CO2.

Explanation:

To calculate the number of moles of CO2 present in 11 grams of CO2, we need to use the molar mass of CO2, which is 44 g/mol. We can set up the calculation as follows:

Number of moles = Mass of CO2 / Molar mass of CO2

Number of moles = 11 g / 44 g/mol

Number of moles = 0.25 mol

Therefore, there are 0.25 moles of CO2 present in 11 grams of CO2.

The pressure inside the cylinder is 8.6 × 10⁻³ atm

Explanation:

At STP, the pressure is 1 atm. As per the Boyle's law, if the temperature of a gas is kept constant then its volume and pressure are inversely proportional to each other. So P₁V₁= P₂V₂

Now we have to find the P₂ as[tex]$\frac{P1V1}{V2}[/tex]

Inserting the given values, in the above expression, P1 = 1 atm, V1 = 0.0155 m³, V2 = 1.81 atm, P2 = ?, we will get P2 as,

P₂ = [tex]$\frac{0.0155\times1}{1.81}[/tex] = 8.6 × 10⁻³ atm

So the pressure inside the cylinder is 8.6 × 10⁻³ atm

0.20 moles of iron will be formed in the reaction.

Explanation:

The balanced chemical equation for the reaction between iron (iii) oxide and carbon monoxide to form Fe is to be known first.

the balanced reaction is :

Fe2O3 + 3CO⇒ 2 Fe + 3 CO2

so from the data given the number of moles of carbon monoxide can be known:

3 moles of CO reacted with Fe2O3 to form 2 moles of iron in the reaction.

Number of moles of CO is 6.20 moles

11.6 gm of iron is formed

so the number of moles of iron formed is calculated as

n = mass of iron ÷ atomic weight of iron

  = 11.6 ÷ 55.84

  = 0.20 moles of iron will be formed when 11.6 gram of iron is produced.

The moles of Iron produced in the chemical reaction has been 0.2 mol.

The moles of product formed and reactant consumed has been given by the stoichiometric values of the balanced chemical equation.

The given balanced chemical equation has been:

[tex]\rm 3\;CO\;+\;Fe_2O_3\;\rightarrow\;2\;Fe\;+\;3\;CO_2[/tex]

The molar mass of Fe has been 55.85 g/mol.

The mass of Fe produced in the chemical reaction has been 11.6 g.

The moles of Fe produced has been:

[tex]\rm Moles=\dfrac{Mass}{Molar\;mass}\\\\ Moles\;Fe=\dfrac{11.6\;g}{55.85\;g/mol}\\\\ Moles\;Fe=0.20\;mol[/tex]

The moles of Iron produced in the chemical reaction has been 0.2 mol.

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Answer:

Molar mass of calcium is 40,078 g / mol

Explanation:

Molar mass (M) is the ratio of the mass to the mass of the substance and is expressed in grams per mole (g / mol).

The molar mass of a substance corresponds/it is equal to the relative atomic or relative molecular mass with the addition of the unit g/mol.

The relative atomic mass as well as the relative molecular mass are the basis for expressing the molar mass (M), the mass of one mole of a substance.

Answer:

Explanation -

A Lewis electron dot symbol is a representation of the valence electrons around an atom that uses dot around the symbol of the element. Cations are formed when atoms lose electrons represented by fewer Lewis dots.

The Lewis Dot Diagram for a cation is a representation of the electron configuration after an atom loses one or more electrons. It shows the symbol of the atom with brackets and the number of valence electrons that have been removed.

The Lewis Dot Diagram for a cation is a representation of the electron configuration of the cation. In general, cations are formed when an atom loses one or more electrons, resulting in a positive charge. The Lewis Dot Diagram for a cation shows the symbol of the atom with brackets and the number of valence electrons that have been removed. For example, the Lewis Dot Diagram for a sodium cation (Na+) would show the symbol Na with brackets and the number 10 inside the brackets, indicating that one electron has been removed.

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Carbon dioxide (CO₂) is the compound where atoms share two electron pairs each, forming two double covalent bonds between carbon and oxygen atoms.

The compound that has atoms sharing 2 electrons in a double covalent bond is carbon dioxide (CO₂). In this molecule, a carbon atom forms two double covalent bonds with two oxygen atoms. This is represented as O=C=O, indicating that each oxygen atom is sharing two electron pairs with the carbon atom. The carbon atom has four electrons in its valence shell and requires four more to become stable. Therefore, each double bond involves the sharing of two electron pairs, which makes a total of four electrons shared with each oxygen atom.

The compound that has atoms sharing 2 electrons is N2, which is nitrogen gas. Nitrogen gas consists of two nitrogen atoms that are bonded together by a triple covalent bond. Each nitrogen atom shares three electrons with the other nitrogen atom, resulting in a total of 6 shared electrons.

Answer:

260.34g

Explanation:

First, you need to know what angelic acid is comprised of. It is written as C₅H₈O₂.

In order to solve for the mass of 2.6 moles of angelic acid, you need the mass of 1 mole of angelic acid. This can be found by adding the masses from the periodic table, like shown below:

5 carbon atoms = (5)(12.01g) = 60.05g

8 hydrogen atoms = (8)(1.01) = 8.08g

2 oxygen atoms = (2)(16) = 32g

angelic acid = 60.05 + 8.08 + 32 = 100.13g

Then, set up a basic stoichiometric equation and solve. The units should cancel out.

[tex](\frac{2.6mol}{1} )(\frac{100.13g}{1mol} )=260.34g[/tex]

The mass in grams of 2.6 moles of angelic acid is 296.78 g.

To find the mass in grams of 2.6 moles of angelic acid, we need to use the molar mass of the compound. The molar mass of angelic acid is the sum of the atomic masses of all the elements present in the compound. According to the chemical formula of angelic acid (C6H10O2), the atomic masses of carbon, hydrogen, and oxygen are 12.01 g/mol, 1.01 g/mol, and 16.00 g/mol respectively.

So, the molar mass of angelic acid can be calculated as:

Molar mass = (6 x atomic mass of carbon) + (10 x atomic mass of hydrogen) + (2 x atomic mass of oxygen)

Molar mass = (6 x 12.01 g/mol) + (10 x 1.01 g/mol) + (2 x 16.00 g/mol)

Molar mass = 72.06 g/mol + 10.10 g/mol + 32.00 g/mol

Molar mass = 114.16 g/mol

The mass in grams of 2.6 moles of angelic acid can be calculated using the following conversion factor:

Mass (g) = Moles x Molar mass

Mass (g) = 2.6 moles x 114.16 g/mol

Mass (g) = 296.78 g

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Answer:

3 moles of [tex]Cl^{-}[/tex] is needed for [tex]Na^{+}[/tex]to be fully consumed.

Explanation:

For the balanced equation:

                                  [tex]Na^{+} + Cl^{-}[/tex]  ⇒  [tex]NaCl[/tex]

First, find the moles of Na corresponding to the 69g used the general definition of mol:

                               [tex]mol Na^{+} = \frac{69 g}{23 g/mol } = 3mol[/tex]

We observe that the equation is balanced and the stoichiometric ratio between them is 1: 1.

According to this, one mole of Na will react with one mole of Cl.

                3 moles of [tex]Cl^{-}[/tex] is needed for [tex]Na^{+}[/tex]to be fully consumed.

Final answer:

To react 69 g of sodium with chlorine to produce sodium chloride, 1.5 moles of chlorine gas are required, following the stoichiometry from the balanced chemical equation 2 Na(s) + Cl₂(g) → 2 NaCl(s)

Explanation:

The student is asking for the number of moles of chlorine needed to react with 69 g of sodium to produce sodium chloride, given the balanced chemical equation:

Balance the Reaction:

2 Na(s) + Cl₂(g) → 2 NaCl(s)

Calculate Moles of Sodium:

First, we need to calculate the number of moles of sodium. The molar mass of sodium (Na) is 22.99 g/mol. Therefore, the number of moles of sodium in 69g is:

moles Na = mass Na / molar mass Na = 69g / 22.99 g/mol = 3 moles (rounded to two significant figures)

Determine Moles of Chlorine:

Using stoichiometry from the balanced equation, 2 moles of sodium react with 1 mole of chlorine. Therefore, if we have 3 moles of sodium, we would need:

moles Cl₂ = moles Na / 2 = 3 moles / 2 = 1.5 moles of Cl₂
Therefore, 1.5 moles of chlorine gas are required to react with 69 g of sodium to produce sodium chloride. This stoichiometry is consistent regardless of the mass of sodium you start with, as long as you're using the correct molar mass to convert grams to moles.

Answer:

D to absorbe energy from the sun's radiation to heat wats

Final answer:

Solar panels can utilize photovoltaics to generate electricity directly, or solar thermal technology to heat water in a house, with option D being the correct usage in the context of heating water.

Explanation:

Solar panels in a house can be used in various ways to harness solar energy. One of the methods is through photovoltaics, which convert sunlight directly into electricity that can be used to power a home's appliances and lighting. Another method is solar thermal technology, which can absorb the Sun’s energy to heat water or air for domestic use. For the question at hand, the correct answer is option D: to absorb energy from the sun’s radiation to heat water. Solar panels absorb electromagnetic waves, particularly visible light and infrared radiation, which is then converted into thermal energy. This thermal energy can be used to heat water in a residential setting, contributing to the home's hot water supply or heating system, and reducing reliance on conventional energy sources.

Answer: Convection

Explanation: It is a form of heat transfer occuring only on fluids such liquids and gases. In convection when fluids gains heat they become less dense and rises which implies that warmer air rises and cooler air sinks.

Answer:

sugar

Explanation:

its classified as an organic compound, not a mineral

also quizlet said so

Answer: Sugar

Explanation: Sugar classifies as an organic compound and so is not a mineral.

Answer: 7.14mol/dm3

Explanation:

Molarity is calculated by dividing the amount of a substance in volume of the solution.

i.e Molarity = (Amount in moles/volume in liters or dm3)

Given that:

Amount of moles = 25.0 moles

Volume = 3.5 liters of solution

Recall that 1 liter = 1dm3

so, 3.5 liters = 3.5dm3

Molarity = (25.0moles/3.5dm3)

= 7.14mol/dm3

Thus, the molarity of the solution is 7.14mol/dm3

Answer:

decomposistion,single replacement,double replacement,and sythesis

Explanation:

nmnbmm

Answer:

Density = Mass / Volume.   so,  x = 90.5 g / 96 mL ... The Density would be 0.942 g/mL

The density of 96 ml of a liquid that has a mass of 90.5 g is 0.942 g/mL.

The density of a material is the measure of how tightly it is packed together. It is expressed as mass per unit volume. Density Formula: = m/V, where is the density, m is the object's mass, and V is its volume.

A dense object is heavier than a less dense object of the same size. An object with a density less than that of water will float on it, while one with a higher density will sink. The density equation is D = M / V, which stands for density equals mass per unit volume.

Given:

Density = ?

Volume = 96 ml

Mass = 90.5 g

Density = Mass / Volume  

Therefore,  

x = 90.5 g / 96 mL

= 0.942 g/mL

Thus, The Density would be 0.942 g/mL

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Answer:

Mass is the measure of the amount of matter in an object. We see that the gravitational force between objects increases as the masses of the objects increase. With distance, we see that the strength of gravity decreases if the distance between two objects increases.

Explanation:

The amount of gravity affecting an object depends on two things: the masses of the objects being attracted and the distance between the objects. Mass is the measure of the amount of matter in an object. ... With distance, we see that the strength of gravity decreases if the distance between two objects increases

Final answer:

Mass, distance, and gravity are interconnected in physics through Newton's law of gravitation.

Explanation:

The relationship between mass, distance, and gravity is described by Newton's law of universal gravitation. This law states that every point mass attracts every other point mass by a force acting along the line intersecting both points. This force is directly proportional to the product of the masses of the two objects and inversely proportional to the square of the distance between their centers.

Mathematically, the force of gravity (F) between two objects with masses m1 and m2 separated by a distance r is given by:

F = G * (m1 * m2) / r^2

where G is the gravitational constant, approximately equal to 6.674 × 10^-11 N m^2/kg^2.

From this equation, we can see that:

1. The force of gravity (F) is directly proportional to the product of the masses (m1 * m2). This means that if the masses of the objects increase, the force of gravity between them also increases.

2. The force of gravity (F) is inversely proportional to the square of the distance (r^2) between the centers of the objects. This means that as the distance between the objects increases, the force of gravity between them decreases rapidly.

The volume will be 2.25 L.

Explanation:

As per Charle's law, the volume of a gaseous system is directly proportional to the temperature provided the system is at constant pressure. Since volume of gas is directly proportional to the temperature of the gas molecules, V∝ T

So, in case there is a change in temperature with constant pressure, then there will be equal change in volume.

[tex]\frac{V_{1}}{V_{2} } = \frac{T_{1}}{T_{2} }[/tex]

Thus, here [tex]V_{1}[/tex] = 4.50 L , [tex]T_{1}[/tex]= 20 °C and [tex]P_{1}[/tex] = [tex]P_{2}[/tex] = 203 k Pa , [tex]T_{2}[/tex] = 10°C.

Since, volume and temperature is directly proportional then there will be increase in volume with increase in temperature and vice versa.

[tex]\frac{4.50}{V_{2} } = \frac{20}{10}[/tex]

[tex]V_{2} = \frac{4.50*10}{20} = 2.25 L[/tex]

So, the new volume is 2.25 L.

Answer:

the pressure is P = 5,94 atm ≈ 6 atm

Explanation:

Following the equation corresponding to the Ideal Gas Law, it is possible to find the system pressure in the silver problem.

                                                  [tex]PV = nRT[/tex]

From this equation, we find the pressure

                                                    [tex]P = \frac{nRT}{V}[/tex]

where:

P is the pressure of the gas,

V is the volume of the gas,

n is the amount of substance of gas (also known as number of moles),

R is the ideal, or universal, gas constant.

Now we find the moles of CO2

[tex]n = \frac{g}{PM}[/tex]

We have 375g of CO2 and its molecular weight is 44g/mol

[tex]nCO_{2} = \frac{375g}{44g/mol} = 8,52 mol[/tex]

Using.

R = 0,082[tex]\frac{L . atm}{K . mol}[/tex]

T = 20ºC = 293,15 K

We substitute in the equation

[tex]P = \frac{nRT}{V}\\\\ P = \frac{8,52 mol . 0,082\frac{L.atm}{K . mol} . 293,15K}{34,5 L}\\[/tex]

P = 5,94 atm ≈ 6 atm

Answer:

Attached.

Explanation:

I'm assuming Lewis structure is fine.

Cresol or trimethylhydroquinone, commonly known as 2,4,6-trimethylphenol, is an organic molecule with the chemical formula C9H12O. Because a hydroxyl group (-OH) is attached to a benzene ring, it is classified as a phenol.

The benzene ring serves as the main structural component of 2,4,6-trimethylphenol, which also has three methyl groups (CH) bonded to the carbon atoms at the 2, 4, and 6 positions. The chemical nomenclature, which refers to the exact locations of the substituents on the ring, is influenced by these methyl groups. At position 1, the hydroxyl group is attached to the benzene ring. 2,4,6-trimethylphenol is a phenolic chemical because it contains a hydroxyl group and exhibits some of the characteristics of phenols.

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Answer:

1.16x10^-23

Explanation:

1 mole of nitrogen has 6.02x10^23 number of nitrogen molecules. each molecule has 2 nitrogen atoms

Answer:

3. 049g

Explanation:

Molar mass of Ca = 40

Molar mass of Cl = 35.5

H = 1, O =16

Molar mass of CaCl2.9H20 = [40 + (35.5*2) + (9*18)]

CaCl2.9H20 = 273g/mol

Molar mass of CaCl2 = 40 + (35.5*2) = 111g/mol

111g of CaCl2 is present in 273g of CaCl2.9H20

Xg of CaCl2 is present in 7.5g of CaCl2.9H20

X = (7.5*111) / 273

X = 3.049g

Final answer:

To find the quantity of pure CaCl₂ in 7.5 g of CaCl₂•9H₂O, you need to calculate the molar masses of both the hydrated and anhydrous forms, find the number of moles in 7.5 g, and then convert this to grams of pure CaCl₂.

Explanation:

To determine the quantity of pure CaCl₂ in 7.5 g of CaCl₂•9H₂O, we first need to calculate the molar mass of the hydrated compound and then the molar mass of anhydrous CaCl₂. After that, using stoichiometry, we find out how many moles of the hydrated compound we have in 7.5 g and convert this to the mass of anhydrous CaCl₂.

The quantity of pure CaCl₂ in 7.5 g of CaCl₂•9H₂O is therefore approximately 3.05 g.

Answer: In my opinion I think the periodic table is the hardest.

Answer:

The products of an endothermic reaction are less chemically stable.

Explanation:

They required an input of energy to create so naturally they are at a higher energy state.

In an endothermic reaction, the products have higher potential energy and are less stable than the reactants.

In an endothermic reaction, the products have higher potential energy and are less stable than the reactants. An endothermic reaction is a chemical reaction that absorbs heat from the surroundings. This means that the products of the reaction have a higher potential energy than the reactants. In other words, the reactants are in a more stable state than the products.

To understand this concept, consider a simple example: the dissociation of water into hydrogen and oxygen gases. This reaction is endothermic because it requires the input of energy to break the bonds between the hydrogen and oxygen atoms in water molecules.

As a result, the products of the reaction, hydrogen and oxygen gases, have a higher potential energy than the reactants, water molecules.

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Answer:

%[tex]Al = 53.1%[/tex]%

%[tex]O = 46.9[/tex]%

Explanation:

If we know the grams of a chemical compound in a specific reaction, it is possible to know the percentage of each atom that composes it.

For the Aluminum Oxide in this problem, we know its total weight and the grams of each component.

therefore we can determine the percentage ratio of its components through:

For Al

%[tex]Al = \frac{mass of Al}{mass of Aluminium oxide} . 100[/tex]%

% [tex]Al = \frac{1,3 g}{2,45 g} . 100[/tex]%

%[tex]Al = 53.1%[/tex]%

In the same way for oxygen

%[tex]O = \frac{mass of O}{mass of Aluminium oxide} . 100[/tex]%

%[tex]O = \frac{1,5 g}{2,45 g} . 100[/tex]%

%[tex]O = 46.9[/tex]%

Answer:

8.31moles of H2O

Explanation:

Avogadro's hypothesis gives us an excellent understanding that 1mole of any substance contains 6.02x10^23 molecules. This means that 1mole H2O also contains 6.02x10^23 molecules.

Now, if 1 mole of H2O contains 6.02x10^23 molecules

Therefore, Xmol of H2O will contain 5.00x10^24 molecules i.e

Xmol of H2O = (5.00x10^24)/6.02x10^23 = 8.31moles of H2O

Answer:

c

Explanation:

Answer:

A(net)

Explanation:

Answer:

Explanation:

A single replacement or single displacement reaction is a reaction in which one substance replaces another.

            A  +   BC →   AC + B

The replacement of an ion in solution by a metal higher in the activity series is a special example of this reaction type.

The relative positions of the elements in the activity series provides the driving force for single displacement reactions.

A double replacement reaction is one in which there is an actual exchange of partners between reacting species. This reaction is more common between ionic substances;

              AB + CD → AC + BD

Such reactions are usually driven by;

Answer:

Ionic compound formula for Sodium chloride is NaCl

Explanation:

NaCl ---------> Na^+ + Cl^-

Answer:

sandstone

Explanation:

allows water to pass