Question 1

How many silicon atoms are there in 1.00 g of silicon?

Accepted Answer

A)  1 atom
B)  0.0356 atoms
C)  2.57 * 1023 atoms
D)  2.14 * 1022 atoms
E)  1.75 * 1025 atomsF) D) and E)
G) A) and B) D

Question 2

How many moles of HCl are represented by 1.0 * 1019 HCl molecules?

Accepted Answer

A)  1.7 * 10-5 mol
B)  1.5 * 10-3 mol
C)  1.0 * 1019 mol
D)  36.5 mol
E)  6.02 * 104 molF) B) and D)
G) None of the above

Question 3

Which of the following samples contains the greatest number of atoms?

Accepted Answer

A)  100 g of Pb
B)  2.0 mole of Ar
C)  0.1 mole of Fe
D)  5 g of He
E)  20 million O2 moleculesF) B) and C)
G) A) and E)

Question 4

Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s) + H2SO4(aq)  →\rarr→  2HCl(g) + Na2SO4(s) 
How many grams of HCl can be prepared from 2.00 mol H2SO4 and 150 g NaCl?

Accepted Answer

A)  7.30 g
B)  93.5 g
C)  146 g
D)  150 g
E)  196 g F) B) and D)
G) None of the above

Question 5

Calculate the volume of 0.15 mole of Br2. The density of Br2 is 3.12 g/mL.

Accepted Answer

Question 6

A compound was discovered whose composition by mass is 85.6% C and 14.4% H. Which of the following could be the molecular formula of this compound?

Accepted Answer

A)  CH4
B)  C2H4
C)  C3H4
D)  C2H6
E)  C3H8F) D) and E)
G) B) and E)

Question 7

How many grams of nitrogen are there in 7.5 g of Ca(NO3) 2?

Accepted Answer

A)  0.64 g
B)  1.3 g
C)  0.15 g
D)  1.15 g
E)  2.3 gF) A) and C)
G) A) and B)

Question 8

Calculate the molecular mass of menthol, C10H20O.

Accepted Answer

A)  156 amu
B)  140 amu
C)  29 amu
D)  146 amu
E)  136 amuF) None of the above
G) A) and B)

Question 9

The mass of four moles of molecular bromine (Br2) is

Accepted Answer

A)  80 g.
B)  320 g.
C)  640 g.
D)  140 g.
E)  24 * 1023 g.F) A) and D)
G) D) and E)

Question 10

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V2O5 with 40.0 g of calcium based on the following chemical reaction? V2O5(s) + 5Ca(l)   →\rarr→  2V(l) + 5CaO(s)

Accepted Answer

A)  11.2 g
B)  5.6 g
C)  22.4 g
D)  40.0 g
E)  20.3 g F) C) and D)
G) B) and D) E

Question 11

Common gases used in laboratories are generally obtained from pressurized metal gas cylinders, but for small amounts of occasionally-used gases, it is sometimes easier just to prepare them chemically. For example, oxygen gas can be prepared by heating KMnO4(s)according to the following chemical reaction:
2KMnO4(s) $\rarr$ K2MnO4(s)+ MnO2(s)+ O2(g)
How many grams of KMnO4 would you need to produce 0.27 moles of O2, assuming 100% conversion? The molar mass of KMnO4 is 158.034 g/mol.

Accepted Answer

Question 12

How many grams of Cl2 can be prepared from the reaction of 16.0 g of MnO2 and 30.0 g of HCl according to the following chemical equation? 
MnO2 + 4HCl  →\rarr→  MnCl2 + Cl2 + 2H2O

Accepted Answer

A)  0.82 g
B)  5.8 g
C)  13.0 g
D)  14.6 g
E)  58.4 g F) B) and C)
G) C) and D)

Question 13

What is the mass of 0.20 mole of C2H6O (ethanol) ?

Accepted Answer

A)  230 g
B)  46 g
C)  23 g
D)  4.6 g
E)  None of these.F) C) and E)
G) B) and D)

Question 14

Calculate the mass of FeS formed when 9.42 g of iron reacts with 8.50 g of sulfur according to the following reaction. Fe(s) + S(s)  →\rarr→  FeS(s)

Accepted Answer

A)  17.9 g
B)  87.9 g
C)  26.0 g
D)  14.8 g
E)  1.91 * 10-3 g F) B) and C)
G) B) and E)

Question 15

When 22.0 g NaCl and 21.0 g H2SO4 are mixed and react according to the equation below, which is the limiting reagent? 
2NaCl + H2SO4  →\rarr→  Na2SO4 + 2HCl

Accepted Answer

A)  NaCl
B)  H2SO4
C)  Na2SO4
D)  HCl
E)  No reagent is limiting. F) All of the above
G) C) and D)

Question 16

What is the mass of 8.25 * 1019 UF6 molecules?

Accepted Answer

A)  352 g
B)  0.0482 g
C)  1.37 * 10-4 g
D)  2.90 * 1022 g
E)  8.25 * 1019 gF) A) and E)
G) D) and E)

Question 17

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2  →\rarr→ __ CO2 + __ H2O

Accepted Answer

A)  1
B)  8
C)  9
D)  26
E)  27 F) D) and E)
G) B) and D)

Question 18

A silver wire has a diameter of 0.500 mm. What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm3)

Accepted Answer

A)  52.3 m
B)  222 m
C)  13.1 m
D)  2.01 m
E)  890 mF) C) and E)
G) A) and B) A

Question 19

The percent composition by mass of tartaric acid is: 32.01% C, 4.03% H, and 63.96% O. Given that the molecular mass of tartaric acid is 150 amu, determine its molecular formula.

Accepted Answer

The answer of The percent composition by mass of tartaric...

Question 20

Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO2(s) + 4HCl(aq)   →\rarr→ MnCl2(aq) + 2H2O(l) + Cl2(g) 
According to the above reaction, which is the limiting reagent when 28 g of MnO2 are reacted with 42 g of HCl?

Accepted Answer

A)  MnO2
B)  HCl
C)  MnCl2
D)  Cl2
E)  No reagent is limiting. F) A) and E)
G) A) and B)

Exam 3: Stoichiometry

How many silicon atoms are there in 1.00 g of silicon?

Correct Answer
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D

How many moles of HCl are represented by 1.0 * 10¹⁹ HCl molecules?

Correct Answer
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Which of the following samples contains the greatest number of atoms?

Correct Answer
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Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s) + H₂SO₄(aq) $\rarr$ 2HCl(g) + Na₂SO₄(s) How many grams of HCl can be prepared from 2.00 mol H₂SO₄ and 150 g NaCl?

Correct Answer
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Calculate the volume of 0.15 mole of Br₂. The density of Br₂ is 3.12 g/mL.

Correct Answer
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A compound was discovered whose composition by mass is 85.6% C and 14.4% H. Which of the following could be the molecular formula of this compound?

Correct Answer
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How many grams of nitrogen are there in 7.5 g of Ca(NO₃) ₂?

Correct Answer
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Calculate the molecular mass of menthol, C₁₀H₂₀O.

Correct Answer
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The mass of four moles of molecular bromine (Br₂) is

Correct Answer
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What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V₂O₅ with 40.0 g of calcium based on the following chemical reaction? V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

Correct Answer
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E

Correct Answer
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How many grams of Cl₂ can be prepared from the reaction of 16.0 g of MnO₂ and 30.0 g of HCl according to the following chemical equation? MnO₂ + 4HCl $\rarr$ MnCl₂ + Cl₂ + 2H₂O

Correct Answer
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What is the mass of 0.20 mole of C₂H₆O (ethanol) ?

Correct Answer
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Calculate the mass of FeS formed when 9.42 g of iron reacts with 8.50 g of sulfur according to the following reaction. Fe(s) + S(s) $\rarr$ FeS(s)

Correct Answer
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When 22.0 g NaCl and 21.0 g H₂SO₄ are mixed and react according to the equation below, which is the limiting reagent? 2NaCl + H₂SO₄ $\rarr$ Na₂SO₄ + 2HCl

Correct Answer
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What is the mass of 8.25 * 10¹⁹ UF₆ molecules?

Correct Answer
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What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ $\rarr$ CO₂ + H₂O

Correct Answer
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A silver wire has a diameter of 0.500 mm. What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm³)

Correct Answer
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A

The percent composition by mass of tartaric acid is: 32.01% C, 4.03% H, and 63.96% O. Given that the molecular mass of tartaric acid is 150 amu, determine its molecular formula.

Correct Answer
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Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO₂(s) + 4HCl(aq) $\rarr$ MnCl₂(aq) + 2H₂O(l) + Cl₂(g) According to the above reaction, which is the limiting reagent when 28 g of MnO₂ are reacted with 42 g of HCl?

Correct Answer
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Exam 3: Stoichiometry

How many silicon atoms are there in 1.00 g of silicon?

Correct AnswerverifiedD

How many moles of HCl are represented by 1.0 * 1019 HCl molecules?

Correct AnswerverifiedShow Answer

Which of the following samples contains the greatest number of atoms?

Correct AnswerverifiedShow Answer

Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s) + H2SO4(aq) →\rarr→ 2HCl(g) + Na2SO4(s) How many grams of HCl can be prepared from 2.00 mol H2SO4 and 150 g NaCl?

Correct AnswerverifiedShow Answer

Calculate the volume of 0.15 mole of Br2. The density of Br2 is 3.12 g/mL.

Correct AnswerverifiedShow Answer

A compound was discovered whose composition by mass is 85.6% C and 14.4% H. Which of the following could be the molecular formula of this compound?

Correct AnswerverifiedShow Answer

How many grams of nitrogen are there in 7.5 g of Ca(NO3) 2?

Correct AnswerverifiedShow Answer

Calculate the molecular mass of menthol, C10H20O.

Correct AnswerverifiedShow Answer

The mass of four moles of molecular bromine (Br2) is

Correct AnswerverifiedShow Answer

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V2O5 with 40.0 g of calcium based on the following chemical reaction? V2O5(s) + 5Ca(l) →\rarr→ 2V(l) + 5CaO(s)

Correct AnswerverifiedE

Correct AnswerverifiedShow Answer

How many grams of Cl2 can be prepared from the reaction of 16.0 g of MnO2 and 30.0 g of HCl according to the following chemical equation? MnO2 + 4HCl →\rarr→ MnCl2 + Cl2 + 2H2O

Correct AnswerverifiedShow Answer

What is the mass of 0.20 mole of C2H6O (ethanol) ?

Correct AnswerverifiedShow Answer

Calculate the mass of FeS formed when 9.42 g of iron reacts with 8.50 g of sulfur according to the following reaction. Fe(s) + S(s) →\rarr→ FeS(s)

Correct AnswerverifiedShow Answer

When 22.0 g NaCl and 21.0 g H2SO4 are mixed and react according to the equation below, which is the limiting reagent? 2NaCl + H2SO4 →\rarr→ Na2SO4 + 2HCl

Correct AnswerverifiedShow Answer

What is the mass of 8.25 * 1019 UF6 molecules?

Correct AnswerverifiedShow Answer

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 →\rarr→ __ CO2 + __ H2O

Correct AnswerverifiedShow Answer

A silver wire has a diameter of 0.500 mm. What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm3)

Correct AnswerverifiedA

The percent composition by mass of tartaric acid is: 32.01% C, 4.03% H, and 63.96% O. Given that the molecular mass of tartaric acid is 150 amu, determine its molecular formula.

Correct AnswerverifiedShow Answer

Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO2(s) + 4HCl(aq) →\rarr→ MnCl2(aq) + 2H2O(l) + Cl2(g) According to the above reaction, which is the limiting reagent when 28 g of MnO2 are reacted with 42 g of HCl?

Correct AnswerverifiedShow Answer

Correct Answer
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D

How many moles of HCl are represented by 1.0 * 10¹⁹ HCl molecules?

Correct Answer
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Correct Answer
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Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s) + H₂SO₄(aq) $\rarr$ 2HCl(g) + Na₂SO₄(s) How many grams of HCl can be prepared from 2.00 mol H₂SO₄ and 150 g NaCl?

Correct Answer
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Calculate the volume of 0.15 mole of Br₂. The density of Br₂ is 3.12 g/mL.

Correct Answer
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Correct Answer
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How many grams of nitrogen are there in 7.5 g of Ca(NO₃) ₂?

Correct Answer
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Calculate the molecular mass of menthol, C₁₀H₂₀O.

Correct Answer
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The mass of four moles of molecular bromine (Br₂) is

Correct Answer
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What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V₂O₅ with 40.0 g of calcium based on the following chemical reaction? V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

Correct Answer
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E

Correct Answer
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How many grams of Cl₂ can be prepared from the reaction of 16.0 g of MnO₂ and 30.0 g of HCl according to the following chemical equation? MnO₂ + 4HCl $\rarr$ MnCl₂ + Cl₂ + 2H₂O

Correct Answer
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What is the mass of 0.20 mole of C₂H₆O (ethanol) ?

Correct Answer
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Calculate the mass of FeS formed when 9.42 g of iron reacts with 8.50 g of sulfur according to the following reaction. Fe(s) + S(s) $\rarr$ FeS(s)

Correct Answer
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When 22.0 g NaCl and 21.0 g H₂SO₄ are mixed and react according to the equation below, which is the limiting reagent? 2NaCl + H₂SO₄ $\rarr$ Na₂SO₄ + 2HCl

Correct Answer
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What is the mass of 8.25 * 10¹⁹ UF₆ molecules?

Correct Answer
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What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ $\rarr$ CO₂ + H₂O

Correct Answer
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A silver wire has a diameter of 0.500 mm. What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm³)

Correct Answer
verified
A

Correct Answer
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Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO₂(s) + 4HCl(aq) $\rarr$ MnCl₂(aq) + 2H₂O(l) + Cl₂(g) According to the above reaction, which is the limiting reagent when 28 g of MnO₂ are reacted with 42 g of HCl?

Correct Answer
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