Question 1

How many molecules are present in 3.16 mol of CaCl₂?

Accepted Answer

The answer of How many molecules are present in 3.16...

Question 2

What is the mass of 3.56 mole of CuCl₂ if the molar mass of CuCl₂ is 134.45 g/mol?

Accepted Answer

The answer of What is the mass of 3.56 mole...

Question 3

How many kilograms of carbon-12 would contain 6.000 × 10²⁶ atoms?

Accepted Answer

One mole of carbon-12 contains 6.022 × 10^23 atoms and weighs 12 grams. To find the mass of 6.000 × 10^26 atoms, calculate the number of moles: (6.000 × 10^26 atoms) / (6.022 × 10^23 atoms/mole) ≈ 996.68 moles. Then, multiply by the molar mass: 996.68 moles × 12 g/mole = 11,960.16 grams, which is approximately 11.95 kilograms.

Question 4

One mole equals _____ things.

Accepted Answer

One mole equals 6.022 × 10^23 things, which is known as Avogadro's number.

Question 5

Sixteen moles of aluminium (Al) react with twenty-four moles of chlorine. How many moles of AlCl₃ are obtained as a result of this reaction?

Accepted Answer

The balanced chemical equation for the reaction between aluminium (Al) and chlorine (Cl2) to form aluminium chloride (AlCl3) is 2Al + 3Cl2 → 2AlCl3. From the stoichiometry of the reaction, 2 moles of Al react with 3 moles of Cl2 to produce 2 moles of AlCl3. Given 16 moles of Al and 24 moles of Cl2, the limiting reactant is Al, which will completely react to form 16 moles of AlCl3, following the stoichiometric ratio.

Question 6

Consider the unbalanced chemical reaction Al + Cl₂ $\rightarrow$ AlCl₃. How many moles of AlCl₃ can be obtained from 360 grams of Cl₂? (Molar masses: Cl = 35.45 g/mol, Al = 26.98 g/mol)

Accepted Answer

First, correct the chemical equation: $2Al + 3Cl_2 \rightarrow 2AlCl_3$. To find moles of $Cl_2$ from 360 g, use its molar mass (70.9 g/mol): $360 \, \text{g} / 70.9 \, \text{g/mol} = 5.08 \, \text{moles of} \, Cl_2$. According to the balanced equation, 3 moles of $Cl_2$ produce 2 moles of $AlCl_3$, so $5.08 \, \text{moles of} \, Cl_2$ will produce $(5.08 \, \text{moles} \times 2 \, \text{moles of} \, AlCl_3) / 3 = 3.39 \, \text{moles of} \, AlCl_3$. The molar mass of $AlCl_3$ is $133.34 \, \text{g/mol}$, so $3.39 \, \text{moles} \times 133.34 \, \text{g/mol} = 451.8 \, \text{g}$, which rounds to 450 g when not considering significant figures.

Question 7

What is the mass of 1 mole of diatomic hydrogen?

Accepted Answer

The mass of 1 mole of diatomic hydrogen (H2) is calculated by adding the atomic masses of two hydrogen atoms. The atomic mass of hydrogen is approximately 1.0079 amu, so for two atoms, it's 2 x 1.0079 = 2.0158 grams per mole.

Question 8

How many CO molecules are formed when one mole of CO₂ reacts with 1.000 mole of carbon?

Accepted Answer

When one mole of CO₂ reacts with one mole of carbon, two moles of CO are formed. Therefore, 2 × 6.022 × 10²³ = 1.204 × 10²⁴ CO molecules are formed.

Question 9

One _____ refers to the number of things equal to the number of atoms in exactly 12 g of carbon-12.

Accepted Answer

A mole is the unit of measurement in the International System of Units (SI) for amount of substance. One mole is defined as the number of things (atoms, molecules, etc.) equal to the number of atoms in exactly 12 grams of carbon-12.

Question 10

Consider the unbalanced equation H₂ + O₂ → H₂O. How many molecules of water is involved in the equation if it is interpreted in terms of moles?

Accepted Answer

The answer of Consider the unbalanced equation H₂ + O₂...

Question 11

Consider the chemical reaction. 2H₂ +O₂ → 2H₂O. How many water molecules can be formed from 15.0 g H₂ if O₂ is available abundantly (Molar mass of H₂ = 2.016 g)?

Accepted Answer

The answer of Consider the chemical reaction. 2H₂ +O₂ →...

Question 12

How many moles of oxygen would yield 120 moles of water molecules in the following chemical reaction? 2C₄H₁₀ + 13O₂ $\rightarrow$ 8CO₂ + 10H₂O

Accepted Answer

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Question 13

Consider the chemical reaction 2CuCl₂ + SO₂ + 2H₂O → 2CuCl + 2HCl + H₂SO₄. How many grams of water is required to produce 14.0 moles of sulphuric acid?

Accepted Answer

The balanced chemical equation is 2CuCl2 + SO2 + 2H2O → 2CuCl + 2HCl + H2SO4. To produce 14.0 moles of H2SO4, 14.0 moles of H2O are required (1:1 ratio from the equation). Since the molar mass of water (H2O) is approximately 18.015 g/mol, the mass of water needed is 14.0 moles * 18.015 g/mol = 252.21 g. However, none of the provided options exactly match this calculation, suggesting a possible mistake in the interpretation of the question or in the options provided. Given the options, 504 g (option D) would be closest to twice the calculated requirement, possibly indicating a misunderstanding in the question's setup or a typographical error in the options.

Question 14

Fe₂O₃(s) + 3SO₃ (g) $\rightarrow$Fe₂(SO₄)₃. This equation explains the formation of iron(III) sulfate. How many molecules of Fe₂(SO₄)₃ are formed if 144 molecules of SO₃ gas is passed through a beaker containing iron(III) oxide?

Accepted Answer

The balanced equation shows that 3 molecules of SO₃ produce 1 molecule of Fe₂(SO₄)₃. Therefore, 144 molecules of SO₃ will produce 144/3 = 48 molecules of Fe₂(SO₄)₃.

Question 15

How many moles of atoms can be found in 70 grams of carbon-12?

Accepted Answer

The answer of How many moles of atoms can be...

Question 16

Consider the chemical equation, Pd + 2 CuCl₂ → 2 CuCl + PdCl₂. How many moles of CuCl₂ is needed to produce 1.6 moles of PdCl₂?

Accepted Answer

The answer of Consider the chemical equation, Pd + 2...

Question 17

Avogadro's number refers to _____.

Accepted Answer

Avogadro's number, 6.022 x 10^23, represents the number of entities (atoms, molecules, ions, etc.) in one mole of a substance, not the number of neutrons, protons, or a ratio of masses.

Question 18

Na + Cl₂ → NaCl. This is an unbalanced chemical equation showing the formation of NaCl. How many chlorine molecules are needed to form 252 molecules of NaCl?

Accepted Answer

The balanced chemical equation is: 2Na + Cl₂ → 2NaCl. So, to form 252 molecules of NaCl, we need 252/2 = 126 molecules of Cl₂.

Question 19

Consider the chemical equation P₄ + 5O₂ $\rightarrow$ P₄O₁₀. How many moles of oxygen are needed to convert 4 moles of phosphorous to P₄O₁₀?

Accepted Answer

The chemical equation seems to be incorrectly formatted, but based on the question, it appears to describe the reaction of phosphorus with oxygen to form a phosphorus oxide. The question states that 5 moles of oxygen are needed to react with 1 mole of phosphorus. Therefore, to convert 4 moles of phosphorus, you would need 4 times 5 moles of oxygen, which equals 20 moles.

Question 20

C₈H₁₈ + O₂ → CO₂ + H₂O. Balance this equation and identify the number H₂O molecules formed when 6 molecules of C₈H₁₈ react with 75 molecules of oxygen.

Accepted Answer

The balanced equation is C18H38 + 26O2 → 18CO2 + 19H2O. For every molecule of C18H38, 19 molecules of H2O are formed. With 6 molecules of C18H38, 6 * 19 = 114 molecules of H2O are formed.

Quiz 5: Stoichiometry and the Mole

How many molecules are present in 3.16 mol of CaCl₂?

What is the mass of 3.56 mole of CuCl₂ if the molar mass of CuCl₂ is 134.45 g/mol?

How many kilograms of carbon-12 would contain 6.000 × 10²⁶ atoms?

One mole equals _____ things.

Sixteen moles of aluminium (Al) react with twenty-four moles of chlorine. How many moles of AlCl₃ are obtained as a result of this reaction?

Consider the unbalanced chemical reaction Al + Cl₂ $\rightarrow$ AlCl₃. How many moles of AlCl₃ can be obtained from 360 grams of Cl₂? (Molar masses: Cl = 35.45 g/mol, Al = 26.98 g/mol)

What is the mass of 1 mole of diatomic hydrogen?

How many CO molecules are formed when one mole of CO₂ reacts with 1.000 mole of carbon?

One _____ refers to the number of things equal to the number of atoms in exactly 12 g of carbon-12.

Consider the unbalanced equation H₂ + O₂ → H₂O. How many molecules of water is involved in the equation if it is interpreted in terms of moles?

Consider the chemical reaction. 2H₂ +O₂ → 2H₂O. How many water molecules can be formed from 15.0 g H₂ if O₂ is available abundantly (Molar mass of H₂ = 2.016 g) ?

How many moles of oxygen would yield 120 moles of water molecules in the following chemical reaction? 2C₄H₁₀ + 13O₂ $\rightarrow$ 8CO₂ + 10H₂O

Consider the chemical reaction 2CuCl₂ + SO₂ + 2H₂O → 2CuCl + 2HCl + H₂SO₄. How many grams of water is required to produce 14.0 moles of sulphuric acid?

Fe₂O₃(s) + 3SO₃ (g) $\rightarrow$ Fe₂(SO₄) ₃. This equation explains the formation of iron(III) sulfate. How many molecules of Fe₂(SO₄) ₃ are formed if 144 molecules of SO₃ gas is passed through a beaker containing iron(III) oxide?

How many moles of atoms can be found in 70 grams of carbon-12?

Consider the chemical equation, Pd + 2 CuCl₂ → 2 CuCl + PdCl₂. How many moles of CuCl₂ is needed to produce 1.6 moles of PdCl₂?

Avogadro's number refers to _____.

Na + Cl₂ → NaCl. This is an unbalanced chemical equation showing the formation of NaCl. How many chlorine molecules are needed to form 252 molecules of NaCl?

Consider the chemical equation P₄ + 5O₂ $\rightarrow$ P₄O₁₀. How many moles of oxygen are needed to convert 4 moles of phosphorous to P₄O₁₀?

C₈H₁₈ + O₂ → CO₂ + H₂O. Balance this equation and identify the number H₂O molecules formed when 6 molecules of C₈H₁₈ react with 75 molecules of oxygen.

Quiz 5: Stoichiometry and the Mole

How many molecules are present in 3.16 mol of CaCl2?

What is the mass of 3.56 mole of CuCl2 if the molar mass of CuCl2 is 134.45 g/mol?

How many kilograms of carbon-12 would contain 6.000 × 1026 atoms?

One mole equals _____ things.

Sixteen moles of aluminium (Al) react with twenty-four moles of chlorine. How many moles of AlCl3 are obtained as a result of this reaction?

Consider the unbalanced chemical reaction Al + Cl2 →\rightarrow→ AlCl3. How many moles of AlCl3 can be obtained from 360 grams of Cl2? (Molar masses: Cl = 35.45 g/mol, Al = 26.98 g/mol)

What is the mass of 1 mole of diatomic hydrogen?

How many CO molecules are formed when one mole of CO2 reacts with 1.000 mole of carbon?

One _____ refers to the number of things equal to the number of atoms in exactly 12 g of carbon-12.

Consider the unbalanced equation H2 + O2 → H2O. How many molecules of water is involved in the equation if it is interpreted in terms of moles?

Consider the chemical reaction. 2H2 +O2 → 2H2O. How many water molecules can be formed from 15.0 g H2 if O2 is available abundantly (Molar mass of H2 = 2.016 g) ?

How many moles of oxygen would yield 120 moles of water molecules in the following chemical reaction? 2C4H10 + 13O2 →\rightarrow→ 8CO2 + 10H2O

Consider the chemical reaction 2CuCl2 + SO2 + 2H2O → 2CuCl + 2HCl + H2SO4. How many grams of water is required to produce 14.0 moles of sulphuric acid?

Fe2O3 (s) + 3SO3 (g) →\rightarrow→ Fe2(SO4) 3. This equation explains the formation of iron(III) sulfate. How many molecules of Fe2(SO4) 3 are formed if 144 molecules of SO3 gas is passed through a beaker containing iron(III) oxide?

How many moles of atoms can be found in 70 grams of carbon-12?

Consider the chemical equation, Pd + 2 CuCl2 → 2 CuCl + PdCl2. How many moles of CuCl2 is needed to produce 1.6 moles of PdCl2?

Avogadro's number refers to _____.

Na + Cl2 → NaCl. This is an unbalanced chemical equation showing the formation of NaCl. How many chlorine molecules are needed to form 252 molecules of NaCl?

Consider the chemical equation P4 + 5O2 →\rightarrow→ P4O10. How many moles of oxygen are needed to convert 4 moles of phosphorous to P4O10?

C8H18 + O2 → CO2 + H2O. Balance this equation and identify the number H2O molecules formed when 6 molecules of C8H18 react with 75 molecules of oxygen.

How many molecules are present in 3.16 mol of CaCl₂?

What is the mass of 3.56 mole of CuCl₂ if the molar mass of CuCl₂ is 134.45 g/mol?

How many kilograms of carbon-12 would contain 6.000 × 10²⁶ atoms?

Sixteen moles of aluminium (Al) react with twenty-four moles of chlorine. How many moles of AlCl₃ are obtained as a result of this reaction?

Consider the unbalanced chemical reaction Al + Cl₂ $\rightarrow$ AlCl₃. How many moles of AlCl₃ can be obtained from 360 grams of Cl₂? (Molar masses: Cl = 35.45 g/mol, Al = 26.98 g/mol)

How many CO molecules are formed when one mole of CO₂ reacts with 1.000 mole of carbon?

Consider the unbalanced equation H₂ + O₂ → H₂O. How many molecules of water is involved in the equation if it is interpreted in terms of moles?

Consider the chemical reaction. 2H₂ +O₂ → 2H₂O. How many water molecules can be formed from 15.0 g H₂ if O₂ is available abundantly (Molar mass of H₂ = 2.016 g) ?

How many moles of oxygen would yield 120 moles of water molecules in the following chemical reaction? 2C₄H₁₀ + 13O₂ $\rightarrow$ 8CO₂ + 10H₂O

Consider the chemical reaction 2CuCl₂ + SO₂ + 2H₂O → 2CuCl + 2HCl + H₂SO₄. How many grams of water is required to produce 14.0 moles of sulphuric acid?

Fe₂O₃(s) + 3SO₃ (g) $\rightarrow$ Fe₂(SO₄) ₃. This equation explains the formation of iron(III) sulfate. How many molecules of Fe₂(SO₄) ₃ are formed if 144 molecules of SO₃ gas is passed through a beaker containing iron(III) oxide?

Consider the chemical equation, Pd + 2 CuCl₂ → 2 CuCl + PdCl₂. How many moles of CuCl₂ is needed to produce 1.6 moles of PdCl₂?

Na + Cl₂ → NaCl. This is an unbalanced chemical equation showing the formation of NaCl. How many chlorine molecules are needed to form 252 molecules of NaCl?

Consider the chemical equation P₄ + 5O₂ $\rightarrow$ P₄O₁₀. How many moles of oxygen are needed to convert 4 moles of phosphorous to P₄O₁₀?

C₈H₁₈ + O₂ → CO₂ + H₂O. Balance this equation and identify the number H₂O molecules formed when 6 molecules of C₈H₁₈ react with 75 molecules of oxygen.