Answer:
a) 2.53 × 10²³ molecules of O₂
b) 31.90 g of KCl
Explanation:
The balance chemical equation for given decomposition reaction is as follow;
2 KClO₃ → 2 KCl + 3 O₂
Part 1:Step 1: Calculate Moles for given amount of KClO₃;
Moles = Mass / M.Mass
Moles = 34.35 g / 122.55 g/mol
Moles = 0.280 moles of KClO₃
Step 2: Find out moles of O₂ produced;
According to eq,
2 moles of KClO₃ produces = 3 moles of O₂
So,
0.280 moles of KClO₃ will produce = X moles of O₂
Solving for X,
X = 0.280 mol × 3 mol / 2 mol
X = 0.42 moles of O₂
Step 3: Calculate No. of Molecules of O₂ as,
No. of Molecules = Moles × 6.022 × 10²³
No. of Molecules = 0.42 mol × 6.022 × 10²³ molecules/mol
No. of Molecules = 2.53 × 10²³ molecules of O₂
Part 2:Step 1: Calculate Moles for given amount of KClO₃;
Moles = Mass / M.Mass
Moles = 52.53 g / 122.55 g/mol
Moles = 0.428 moles of KClO₃
Step 2: Find out moles of KCl produced;
According to eq,
2 moles of KClO₃ produces = 2 moles of KCl
So,
0.428 moles of KClO₃ will produce = X moles of KCl
Solving for X,
X = 0.428 mol × 2 mol / 2 mol
X = 0.428 moles of KCl
Step 3: Calculate Mass of KCl as;
Mass = Moles × M.Mass
Mass = 0.428 mol × 74.55 g/mol
Mass = 31.90 g of KCl
By calculating the number of moles of KClO3 and using the stoichiometric ratios in the balanced equation, we find that 34.35 grams of KClO3 will produce about 2.53 x 10^23 molecules of O2, and that 52.53 grams of KClO3 will form about 31.97 grams of KCl.
Explanation:The first thing we should do is calculate the molar mass of KClO3 which is approximately 122.55 g/mol. Then, find the number of moles of KClO3 in each part of the question.
a. The number of moles in 34.35 grams of KClO3 is 34.35 g / 122.55 g/mol = 0.2803 mol. From our balanced equation we know we get 3 molecules of O2 for every 2 molecules of KClO3, so we get 0.2803 mol x (3/2) = 0.4205 mol of O2. In molecules, this is 0.4205 mol x Avogadro's number (6.022 x 10^23) = 2.53 x 10^23 molecules of O2.
b. For 52.53 grams of KClO3 we get a number of moles equal to 52.53 g / 122.55 g/mol = 0.4288 mol. Following the balanced equation, we get an equal amount of KCl, thus 0.4288 mol. In grams, this is 0.4288 mol x 74.55 g/mol (molar mass of KCl) = 31.97 grams of KCl.
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Which process releases the most heat?
- the condensation of 10 g of gaseous water
- the melting of 10 g of ice
- the freezing of 10 g of liquid water
- the boiling of 10 g of liquid water
Answer:
the boiling of 10g of liquid water
Answer:
The correct option is "the condensation of 10 g of gaseous water"
Explanation:
In condensation,gaseous stats is changes into liquid. So it will release more energy to convert from one state to another state.So it is exothermic process in which heat is released.
How many grams of Chromium Chloride III are needed to produce 75.0 of Silver Chloride?
CrCl3 + AgNO3 --> Cr(NO3) +AgCL
Answer: 27.61g
Explanation:
First thing first, generate a balanced equation for the reaction as illustrated below:
CrCl3 + 3AgNO3 —> Cr(NO3)3 + 3AgCl
Next, we'll find the molar mass of CrCl3 and AgCl:
Molar Mass of CrCl3 = 52 + (3x35.5)
= 158.5g/mol
Molar Mass of AgCl = 108 + 35.5 = 143.5g/mol
But from the balanced equation, 3 mol of AgCl was produced. Therefore, the mass conc. of AgCl from the equation = 3 x 143.5 = 430.5g.
From the equation,
158.5g of CrCl3 produced 430.5g of AgCl.
Therefore, Xg of CrCl3 will produce 75g of AgCl i.e
Xg of CrCl3 = (158.5x75) / 430.5 =27.61g.
So, 27.61g of CrCl3 will produce 75g of AgCl
Final answer:
The problem requires balancing the chemical equation and performing stoichiometry calculations to find how many grams of CrCl₃ are required to produce 75.0 grams of AgCl. Additionally, the use of Ksp allows for the prediction of precipitation conditions in solutions.
Explanation:
The student's question involves a stoichiometry calculation and the solubility product concept, both of which are key topics in chemistry. To find the grams of Chromium Chloride III (CrCl₃) needed to produce 75.0 grams of Silver Chloride (AgCl), one needs to follow these steps:
Balance the chemical equation, although the provided equation lacks coefficients and products for Chromium Nitrate. Assuming it's Cr(NO₃)₃, it should be balanced as CrCl₃ + 3AgNO₃ -> Cr(NO₃)₃ + 3AgCl.Calculate the molar mass of AgCl and CrCl₃.Use stoichiometry to convert from grams of AgCl to moles, then use the mole ratio from the balanced equation to find moles of CrCl₃ needed.Finally, multiply the moles of CrCl₃ by its molar mass to find the grams required.As for the solubility product (Ksp) questions, they are based on the solubility equilibrium and precipitation. For instance, the Ksp for silver chloride (AgCl) is calculated using the concentration of silver ions [Ag⁺] and chloride ions [Cl⁻] in the solution at equilibrium. If given the Ksp and one ion concentration, you can determine the concentration at which precipitation occurs by rearranging the Ksp expression.
How many electromagnetic forces exist?
a one
b. two
c.
d
three
four
Please select the best answer from the choices provided
Answer:
c
Explanation:
there just issues with this site I'm not sure of
A gas occupies 97 mL at 130 kPa. Find its volume at 225 kPa You must show all of your work to receive credit. Also, name the gas law you used to solve the problem. 1 point- Identify which of the Gas Laws you used to solve the problem. 3 points- Show your work on solving the problem. (4 points)
Boyle's law is used to solve this problem.
The Volume occupied is 56 mL.
Explanation:
As per the Boyle's law, Pressure and volume are inversely proportional to each other, when mass and temperature remains constant or the product of the volume and pressure remains constant.
PV = C
P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
= 130 × 97 / 225
= 56 mL
Aluminum reacts with sulfur to form aluminum sulfide according to the following reaction:
2 Al (s) + 3 S (s) → Al2S3 (s)
How many moles of sulfur will be need to produce 6 moles of aluminum sulfide?
a.
2 mol S
b.
3 mol S
c.
12 mol S
d.
15 mol S
e.
18 mol S
Answer:
Explanation:
x mol 6 mol
2 Al (s) + 3 S (s) → Al2S3 (s)
3 mol 1 mol
6 mol Al2S3 x 3 mol S/ 1 mol Al2S3 = 18 mol S
What is the final step in the scientific method?
Answer:
Developing a Conclusion
Answer:
The conclusion
Explanation:
It states what the final results are and helps you double check if your hypothesis was correct.
A few minerals are common but most are
What is the answer to 4x - 16
Answer:-64
Explanation:
Tin oxide reacts with hydrogen to produce tin and water how many moles of SnO2 are needed to produce 500.0 g of Sn
Answer:
4.21 mol of SnO₂
Explanation:
The balance chemical equation for this single replacement reaction is as follow;
SnO₂ + 2 H₂ → Sn + 2 H₂O
Step 1: Calculate moles of Sn as:
Moles = Mass / A.Mass
Moles = 500 g / 118.71 g/mol
Moles = 4.21 moles
Step 2: Find out moles of SnO₂ as,
According to balance equation,
1 mole of Sn is produced by = 1 mole of SnO₂
So,
4.21 moles of Sn will be produced by = X moles of SnO₂
Solving for X,
X = 1 mol × 4.21 mol / 1 mol
X = 4.21 mol of SnO₂
chemistry questions?
Answer:
no <3
Explanation:
What color do we see when all light is reflected?
Answer:
white
Explanation:
If only blue light is shone onto a red shirt, the shirt would appear black, because the blue would be absorbed and there would be no red light to be reflected. White objects appear white because they reflect all colors. Black objects absorb all colors so no light is reflected.
Answer:
White
Explanation:
Help with this?Show work please :)
Answer: 3.2778x10-10 moles Ca
Explanation: solution
1.974x10-¹⁴ atoms Ca x 1 mole Ca/ 6.022x10²³ atoms Ca
= 3.278x10-10 moles Ca
Which feature forms at convergent
boundaries?
A mountain range
B trench
C rift valley
D mid-ocean ridge
Final answer:
Convergent boundaries can form both mountain ranges and trenches, but the specific feature formed depends on whether the boundary involves an oceanic plate or a continental plate.
Explanation:
At convergent boundaries, tectonic plates move toward each other. The type of feature that forms at convergent boundaries depends on the types of plates involved and their interactions. Here are the possible features associated with convergent boundaries:
A. Mountain Range: Formed when two continental plates collide, resulting in the uplift of crustal material and the creation of a mountainous region.
B. Trench: Formed when an oceanic plate collides with a continental plate, causing the denser oceanic plate to subduct beneath the continental plate. This leads to the formation of a deep ocean trench.
C. Rift Valley: This typically forms at divergent boundaries where tectonic plates move away from each other. It is not a typical feature of convergent boundaries.
D. Mid-Ocean Ridge: Formed at divergent boundaries where oceanic plates move apart, allowing magma to rise from the mantle and create a new oceanic crust. It is not a typical feature of convergent boundaries.
Convergent boundaries are zones where plates move together. When an ocean plate meets a continental plate, the heavier ocean plate is pushed beneath the continental plate, forming a trench. When two continental plates collide, they smash into each other, forming a large mountain range. Hence, the correct answer is A. mountain range.
What role can fire play in the life cycle of some gymnosperms? It can help cones open and release seeds. It can produce the sticky liquid to help capture pollen. It can allow seeds to develop faster into mature plants. It can prevent plants from releasing too much pollen.
Answer:
The correct answer is : It can help cones to open and release seeds.
Explanation:
Gymnosperms like Conifers and Pines grow in high altitudes under extreme weather conditions. Higher altitudes have severely cold climate accompanied with water mostly remaining in the ice form.This is the reason why the cones produced by these plants are too hard to be destroyed by the extremely harsh conditions.But during germination these cones need to open and release the seeds.The best natural way for this is by the means of fire which burn the outer harder layer of the cone and release the seeds.Answer:
The answer is A. It can help cones open and release seeds.
Explanation:) edge 2023 brainliest would be appreciated
i need helpppp! i don’t understand this
Answer: a. 410 K
b. 296 K
c. 394 K
d. -180 °C
e. 224°C
f. -3 °C
Explanation:
For °C to K : use °C + 273 = K
For K to °C : use °C = K - 273
1. What is the primary source of energy used by
producers during photosynthesis?
A. thermal energy from the sun
B. light energy from the sun
C. chemical energy from food and oxygen
D. chemical energy from carbon dioxide and
water
Answer:
b
Explanation:
In photosynthesis, light energy from the sun is harvested and it is converted into chemical energy. The primary source of energy used by producers during photosynthesis is light energy from the sun. The correct option is B.
What is photosynthesis?The process which takes place in the chloroplasts through photosynthetic pigments like chlorophyll a, chlorophyll b, carotene and xanthophyll to synthesize nutrients by using carbon dioxide, water and sunlight is known as the photosynthesis.
The plants use light energy to convert carbon dioxide and water into glucose and oxygen. This sugar molecules are used by the green plants as the energy source which helps them to grow.
The process photosynthesis is also exhibited by the algae, cyanobacteria, etc. to convert solar energy into chemical energy. Light is the major factor which complete this process.
Thus the correct option is B.
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What would happen of scientific knowledge was not debated and confirmed by scientist?
Answer: the world wouldn’t be the same today
Explanation:
What is the maximum number of orbitals with: n = 4, L= 1
Answer:3
Explanation: I
'm not sure
The maximum number of orbitals with n = 4, L = 1 is 16, distributed among s, p, d, and f subshells.
There can be a total of 16 orbitals. These include: one 4s orbital, three 4p orbitals, five 4d orbitals, and seven 4f orbitals. Each subshell has a specific number of orbitals based on the values of ml.
The student has asked about the maximum number of orbitals with n = 4 and L= 1. In quantum chemistry, the principal quantum number n determines the shell, and the azimuthal or angular momentum quantum number L (also denoted as l) determines the subshell type. For n = 4, l can have values of 0 (s subshell), 1 (p subshell), 2 (d subshell), and 3 (f subshell). When l = 1, which is the p-type subshell, the magnetic quantum number ml can have three values: -1, 0, and +1. Thus, there are three orbitals corresponding to the p subshell when n = 4 and l = 1, namely the 4p orbitals.
Which statements best describe the process of radioactive decay? Check all that apply.
An unstable isotope changes until it reaches a different element that is stable.
An unstable isotope changes until it reaches a different isotope of the same element that is stable.
Explanation:
Radioactive decay is the breakdown of an unstable (heavier) atom into stable (lighter) atom. It mainly involves the loss of atomic nucleic particles such as protons and neutrons. If protons are lost in the decay, then the element of the atom will change. However, if only a few neutrons are lost, the element may remain the same but the products will be a more stable isotope of the same element with fewer neutrons (hence also mass number)
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The statements that best describe the process of radioactive decay are:
An unstable isotope changes until it reaches a different element that is stable.An unstable isotope changes until it reaches a different isotope of the same element that is stable.The statements that best describe the process of radioactive decay are:
1. An unstable isotope changes until it reaches a different element that is stable.
- This statement is correct. Radioactive decay involves the transformation of an unstable isotope into a different element, which can be stable.
2. An unstable isotope changes until it reaches a different isotope of the same element that is unstable.
- This statement is also correct. In some cases, the process of radioactive decay can lead to the formation of a different isotope of the same element, and this isotope may remain unstable.
The other statements are not accurate:
- An unstable isotope changes until it reaches a different isotope of the same element that is unstable.
- An unstable isotope changing into a different element that is unstable is not a common outcome of radioactive decay.
- A stable isotope does not change into a different element through radioactive decay.
In summary, radioactive decay involves the transformation of unstable isotopes into different elements or isotopes, which can be either stable or unstable.
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The probable question may be:
Which statements best describe the process of radioactive decay? Check all that apply.
An unstable isotope changes until it reaches a different element that is unstable.
An unstable isotope changes until it reaches a different element that is stable.
A stable isotope changes until it reaches a different element that is unstable.
A stable isotope changes until it reaches a different element that is stable.
An unstable isotope changes until it reaches a different isotope of the same element that is unstable.
An unstable isotope changes until it reaches a different isotope of the same element that is stable.
Which of the following pressures is equal to 303,900 pa?
3.0 atm
303.9 atm
303,900 atm
3.00 mm Hg
Answer:
3.0 atm is correct
Explanation:
303,900 pa = 2.999259 atm
303,900 pa = 2279.4371 mmHg
Answer:3atm
Explanation:
101325 Pa = 1atm
303,900 Pa = 303,900/101325 = 3atm
The major ways people are exposed to toxins are by ingesting them, inhaling them, injecting
them, or absorbing them through the skin.
It is true that the major ways people are exposed to toxins are by ingesting them, inhaling them, injecting them, or absorbing them through the skin.
Explanation:
Toxins can enter in four various ways into our body often referred as "route of exposure". It is one among many factors affecting toxicity.
Inhalation: When the toxin is a gas, it is usually absorbed into the body by inhalation. Inhalation of toxins may cause respiratory and lung damage. Eg: cigarette smoke
Absorption: If a toxin enters the human eye or skin, it can be absorbed into the bloodstream. This is called absorption. The skin can prevent some toxins from entering the body. For example: work stations (gas stations) where people work with toxins
Ingestion means that the person has ingested the toxin. Some chemicals cannot get into blood from digestive tract. For example: drinking contaminated water.
The injected toxin enters the body when the person carrying the toxin breaks the skin. Injections can end in veins, muscles or just under the skin. Eg: Botulinum (used to get rid of wrinkles)
In bio-chemistry, poison, a natural or synthetic substance that damages living tissue and has a harmful or lethal effect on the body, regardless of whether it is absorbed, inhaled or injected through the skin.
Sterling silver is:
A) a heterogeneous mixture
B) colloid
C) an element
D) Homogeneous mixture
Answer:
It’s D
Explanation:
It’s an alloy so it is not pure. If you take a small sample and analyze it, the mixture will be similar throughout. Think of Gatorade as a homogeneous mixture because it is the same concentration of all ingredients throughout. Think of pizza for heterogeneous mixtures. There isn’t the pepperoni (or whatever you prefer) throughout.
Sterling silver is a homogeneous mixture, or a solution, because it is a combination of silver and other metals that are uniformly mixed together to create a consistent composition.
Explanation:Sterling silver is considered to be a homogeneous mixture, or a solution. A homogeneous mixture is a combination of two or more substances that are so intimately mixed that they behave as a single substance. In the case of sterling silver, it is a mixture of silver and other metals, such as copper, that are uniformly mixed together to create a uniform composition throughout.
How does one determine the number of core electrons an atom has?
O
A. Subtract the atomic number from the atomic mass.
O
B. Subtract the group number from the atomic number.
O
C. Add the atomic number and the number of valence electrons.
O
D. Add the group number and the period number.
The one to determine the number of core electrons an atom has To subtract the group number from the atomic number. Therefore, option B is correct.
What is an atomic number ?The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number.
The number of protons in an atom is the atomic number. It is sometimes referred to as the proton number for this reason. The capital letter Z is used to represent it in calculations. The word zahl, which meaning number of numerals in German, is where the letter Z originates.
The atomic number, or number of protons, is displayed in the upper left. The element's letter sign appears in the centre.
Thus, option B is correct.
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1gallon=3.79 liters, The gas tank of a car holds 15 gallons.if you were traveling in Europe how many liters if petrol would you need to fill the tank?
How many molecules are in 1.25 mil of oxygen dichlorvos, OCL2?
Answer:
7.52 × 10²³ Molecules of OCl₂
Explanation:
As we know one mole of any substance contains 6.022 × 10²³ particles (atoms, ions, molecules or formula units). This number is also called as Avogadro's Number.
The relation between Moles, Number of Particles and Avogadro's Number is given as,
Number of Particles = Moles × 6.022 × 10²³
In given statement the particles are the molecules of Oxygen dichloride OCl₂ Hence,
Putting values,
Molecules of OCl₂ = 1.25 mol × 6.022 × 10²³ Molecules/mol
Molecules of OCl₂ = 7.52 × 10²³ Molecules
5. What is the temperature -34°C expressed in kelvins?
A. 207 K
B. 339 K
C. 239
D. 139 K
Answer:
C. 239
Explanation:
-34 + 273.15 = 239.15
The equation to convert celsius into kelvin is C = K - 273.15
how many electrons were transferred if the total charge of a process is 919.4 C
The number of electrons transferred of the process is 5746.25×[tex]10^{18}[/tex]e.
Explanation:
The electron is known as the subatomic particle which revolves around the nucleus by possessing the negative charge. when the atoms are involved in the reaction or process these electrons are transferred are gained by the atoms. Coulomb is the term used to express the charge of the electrons. In normal 1 coulomb of charge possess 6.25× [tex]10^{18}[/tex] electrons. So here the total charge of the process is 919.4c in order to find number of electrons transferred is found by the product of 919.4 × 6.25× = 5746.25 × [tex]10^{18}[/tex].Thus the number of electrons transferred is obtained. the transferred electrons are 5746.25 ×[tex]10^{18}[/tex].The number of electrons that were transferred is 5.746 × 10²¹
From the question,
We are to determine the number of electrons that were transferred.
Using the formula
Q = ne
Where
Q is the total charge
n is the number of electrons
and e is the charge of 1 electron (e = 1.6 × 10⁻¹⁹ C)
From the given information
Q = 919.4 C
Putting this into the formula, we get
919.4 = n × 1.6 × 10⁻¹⁹
∴ n = 919.4 ÷ (1.6 × 10⁻¹⁹)
n = 5.746 × 10²¹
Hence, the number of electrons that were transferred is 5.746 × 10²¹
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What words can you spell isotherm periodic table
Answer: ?????????????????????
Explanation:
When a match is lit, sulfur (S8) reacts with oxygen to release energy and form sulfur dioxide, SO2. Write the balanced equation for this reaction.
Answer: S8 + 8O2 => 8SO2
Explanation: The equation is now balanced. Both Sulfur have 8 atoms in the reactant and product side. Oxygen have 16 atoms on each side.
A geologist is studying an area where stream erosion and deposition are the dominant surface processes. He notices that all of the rock layers in the shallow streambeds have dune features preserved throughout them. Knowing that dunes are formed by the wind in desert settings, what can the geologist conclude about the geologic history of this area? A. The depositional environment has changed from stream-dominated in the past to wind-dominated today. B. Wind must still be the dominant factor shaping the surface today. C. Dunes must also form from streams, at least in this area. D. The depositional environment has changed from wind-dominated in the past to stream-dominated today.
Answer: A)
Explanation:
the deposition environment has changed from wind-dominated in the past to stream-dominated today.
Final answer:
The presence of dune features in the streambeds suggests that the geologic history of the area involved a change in the depositional environment from wind-dominated to stream-dominated over time.
Explanation:
The geologist studying the presence of dune features in streambeds can conclude about the geologic history of the area that there has been a change in the depositional environment. Specifically, the correct answer is D.
The depositional environment has changed from wind-dominated in the past to stream-dominated today. This conclusion is based on the understanding that dunes, with their characteristic cross-bedding patterns, are typically formed by wind in desert environments.
Thus, finding these dune features preserved in current streambeds indicates that the area was once a desert with active wind erosion and deposition, but now it is characterized by stream erosion and deposition.
Erosion and deposition are dynamic processes that reflect changes in Earth's surface through time. The study of sedimentary structures like cross-bedding is fundamental in reconstructing paleoenvironments and understanding how the forces of wind, water, and other elements have shaped the landscape.
Recognizing cross-bedding patterns within sediments allows geologists to determine the direction of the ancient winds or water flows that created them.