Question 1

How many moles of Cl atoms are there in 65.2 g CHCl3?

Accepted Answer

A)  0.548 mol
B)  1.09 mol
C)  3.3 * 1023 mol
D)  1.64 mol
E)  3.0 molF) None of the above
G) A) and B)

Question 2

A method for producing pure copper metal involves the reaction of copper(I) sulfide with oxygen gas to give copper metal and sulfur dioxide. Suppose the yield of this reaction is 87%.What mass of a copper ore consisting of 46% copper(I) sulfide must be mined in order to produce 1.0 *103 kg (1.0 metric ton) of copper metal?

Accepted Answer

A)  1.4 * 103 kg
B)  3.2 * 103 kg
C)  1.3 * 103 kg
D)  1.5 * 103 kg
E)  8.0 * 103 kgF) A) and E)
G) D) and E)

Question 3

How many moles of O atoms are in 25.7 g of CaSO4?

Accepted Answer

A)  0.189 mol
B)  0.755 mol
C)  4.00 mol
D)  1.14 * 1023 mol
E)  4.55 * 1023 molF) B) and D)
G) A) and E)

Question 4

What is the average mass, in grams, of one potassium atom?

Accepted Answer

A)  5.14 * 10-23 g
B)  6.49 * 10-23 g
C)  6.02 * 10-18 g
D)  31.0 g
E)  39.1 gF) A) and E)
G) A) and D)

Question 5

Calculate the molecular mass of menthol, C10H20O.

Accepted Answer

A)  156 amu
B)  140 amu
C)  29 amu
D)  146 amu
E)  136 amuF) A) and B)
G) A) and C)

Question 6

Phosphorus reacts with iodine as shown in the chemical reaction below.What is the percent yield of the reaction if 28.2 g PI3 is obtained from the reaction of 48.0 g of I2 with excess phosphorus?
2P(s)+ 3I2(s)$\rarr$2PI3(s)

Accepted Answer

Question 7

The molecular formula of aspirin is C9H8O4. How many aspirin molecules are present in one 500-milligram tablet?

Accepted Answer

A)  2.77 molecules
B)  2.77 * 10-3 molecules
C)  1.67 * 1024 molecules
D)  1.67 * 1021 molecules
E)  None of these is correct.F) C) and D)
G) B) and D)

Question 8

When a 0.952 g sample of an organic compound containing C, H, and O is burned completely in oxygen, 1.35 g of CO2 and 0.826 g of H2O are produced. What is the empirical formula of the compound?

Accepted Answer

Question 9

A chemistry student determined the empirical formula for titanium sulfide (TixSy).To do so, she reacted titanium with excess sulfur in a crucible, and recorded the following data:  What is the empirical formula of titanium sulfide?

Accepted Answer

Question 10

Which one of the following does not represent 1.00 mol of the indicated substance?

Accepted Answer

A)  6.02 * 1023 C atoms
B)  26.0 g Fe
C)  12.01 g C
D)  65.4 g Zn
E)  6.02* 1023 Fe atomsF) A) and B)
G) D) and E)

Question 11

What is the theoretical yield of PI3 from the reaction of 27.0 g of P and 68.0 g of I2?
2P(s)+ 3I2(s)$\rarr$ 2PI3(s)

Accepted Answer

Question 12

What is the minimum mass of sulfur dioxide necessary to produce 200.g of sulfuric acid in the following reaction?
2SO2 + O2 + 2H2O $\rarr$2H2SO4

Accepted Answer

Question 13

Calculate the percent composition by mass of sodium in Na2CO3.

Accepted Answer

Question 14

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 C)
G) C) and D)

Question 15

One mole of iron

Accepted Answer

A)  is heavier than one mole of lead (Pb) .
B)  is 77.0 g of iron.
C)  is 26.0 g of iron.
D)  weighs the same as one mole of lead.
E)  None of the above.F) A) and C)
G) A) and E)

Question 16

What is the mass of 7.80 * 1018 carbon atoms?

Accepted Answer

A)  1.30 * 10-5 g
B)  6.43 * 103 g
C)  7.80 * 1018 g
D)  1.56 * 10-4 g
E)  12.01 gF) A) and E)
G) A) and D)

Question 17

Refer to the (unbalanced)equation CS2 + CaO $\rarr$ CO2 + CaS. How many grams of CaS are produced if 53 g of CO2 are produced?

Accepted Answer

Question 18

How many sulfur atoms are there in 21.0 g of Al2S3?

Accepted Answer

A)  8.42 * 1022 atoms
B)  2.53 * 1023 atoms
C)  2.14 * 1023 atoms
D)  6.02 * 1023 atoms
E)  6.30 * 1026 atomsF) A) and B)
G) B) and D)

Question 19

Balance the following chemical equation:
C4H10 + O2 $\rarr$CO2 + H2O

Accepted Answer

2C₄H₁₀ + 13 O...

Question 20

If 0.274 moles of a substance weighs 62.5 g, what is the molar mass of the substance, in units of g/mol?

Accepted Answer

A)  2.28 * 102 g/mol
B)  1.71 * 101 g/mol
C)  4.38 * 10-3 g/mol
D)  2.17 * 102 g/mol
E)  none of theseF) B) and E)
G) A) and E)

Exam 3: Mass Relationships in Chemical Reactions

What is the minimum mass of sulfur dioxide necessary to produce 200.g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄

Correct Answer
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The molecular formula of aspirin is C₉H₈O₄. How many aspirin molecules are present in one 500-milligram tablet?

Correct Answer
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Calculate the molecular mass of menthol, C₁₀H₂₀O.

Correct Answer
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Which one of the following does not represent 1.00 mol of the indicated substance?

Correct Answer
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What is the mass of 7.80 * 10¹⁸ carbon atoms?

Correct Answer
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When a 0.952 g sample of an organic compound containing C, H, and O is burned completely in oxygen, 1.35 g of CO₂ and 0.826 g of H₂O are produced. What is the empirical formula of the compound?

Correct Answer
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Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS. How many grams of CaS are produced if 53 g of CO₂ are produced?

Correct Answer
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How many moles of Cl atoms are there in 65.2 g CHCl₃?

Correct Answer
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Correct Answer
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What is the average mass, in grams, of one potassium atom?

Correct Answer
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How many moles of O atoms are in 25.7 g of CaSO₄?

Correct Answer
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Phosphorus reacts with iodine as shown in the chemical reaction below.What is the percent yield of the reaction if 28.2 g PI₃ is obtained from the reaction of 48.0 g of I₂ with excess phosphorus? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Correct Answer
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A chemistry student determined the empirical formula for titanium sulfide (Ti_xS_y).To do so, she reacted titanium with excess sulfur in a crucible, and recorded the following data: What is the empirical formula of titanium sulfide?

Correct Answer
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Balance the following chemical equation: C₄H₁₀ + O₂ $\rarr$ CO₂ + H₂O

Correct Answer
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2C₄H₁₀ + 13 O...
View Answer

One mole of iron

Correct Answer
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How many sulfur atoms are there in 21.0 g of Al₂S₃?

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

Correct Answer
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Calculate the percent composition by mass of sodium in Na₂CO₃.

Correct Answer
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If 0.274 moles of a substance weighs 62.5 g, what is the molar mass of the substance, in units of g/mol?

Correct Answer
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What is the theoretical yield of PI₃ from the reaction of 27.0 g of P and 68.0 g of I₂? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Correct Answer
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Exam 3: Mass Relationships in Chemical Reactions

What is the minimum mass of sulfur dioxide necessary to produce 200.g of sulfuric acid in the following reaction? 2SO2 + O2 + 2H2O →\rarr→ 2H2SO4

Correct AnswerverifiedShow Answer

The molecular formula of aspirin is C9H8O4. How many aspirin molecules are present in one 500-milligram tablet?

Correct AnswerverifiedShow Answer

Calculate the molecular mass of menthol, C10H20O.

Correct AnswerverifiedShow Answer

Which one of the following does not represent 1.00 mol of the indicated substance?

Correct AnswerverifiedShow Answer

What is the mass of 7.80 * 1018 carbon atoms?

Correct AnswerverifiedShow Answer

When a 0.952 g sample of an organic compound containing C, H, and O is burned completely in oxygen, 1.35 g of CO2 and 0.826 g of H2O are produced. What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

Refer to the (unbalanced)equation CS2 + CaO →\rarr→ CO2 + CaS. How many grams of CaS are produced if 53 g of CO2 are produced?

Correct AnswerverifiedShow Answer

How many moles of Cl atoms are there in 65.2 g CHCl3?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the average mass, in grams, of one potassium atom?

Correct AnswerverifiedShow Answer

How many moles of O atoms are in 25.7 g of CaSO4?

Correct AnswerverifiedShow Answer

Phosphorus reacts with iodine as shown in the chemical reaction below.What is the percent yield of the reaction if 28.2 g PI3 is obtained from the reaction of 48.0 g of I2 with excess phosphorus? 2P(s)+ 3I2(s) →\rarr→ 2PI3(s)

Correct AnswerverifiedShow Answer

A chemistry student determined the empirical formula for titanium sulfide (TixSy).To do so, she reacted titanium with excess sulfur in a crucible, and recorded the following data: What is the empirical formula of titanium sulfide?

Correct AnswerverifiedShow Answer

Balance the following chemical equation: C4H10 + O2 →\rarr→ CO2 + H2O

Correct Answerverified2C4H10 + 13 O...View AnswerShow Answer

One mole of iron

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How many sulfur atoms are there in 21.0 g of Al2S3?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Calculate the percent composition by mass of sodium in Na2CO3.

Correct AnswerverifiedShow Answer

If 0.274 moles of a substance weighs 62.5 g, what is the molar mass of the substance, in units of g/mol?

Correct AnswerverifiedShow Answer

What is the theoretical yield of PI3 from the reaction of 27.0 g of P and 68.0 g of I2? 2P(s)+ 3I2(s) →\rarr→ 2PI3(s)

Correct AnswerverifiedShow Answer

What is the minimum mass of sulfur dioxide necessary to produce 200.g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄

Correct Answer
verified

The molecular formula of aspirin is C₉H₈O₄. How many aspirin molecules are present in one 500-milligram tablet?

Correct Answer
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Calculate the molecular mass of menthol, C₁₀H₂₀O.

Correct Answer
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Correct Answer
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What is the mass of 7.80 * 10¹⁸ carbon atoms?

Correct Answer
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When a 0.952 g sample of an organic compound containing C, H, and O is burned completely in oxygen, 1.35 g of CO₂ and 0.826 g of H₂O are produced. What is the empirical formula of the compound?

Correct Answer
verified

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS. How many grams of CaS are produced if 53 g of CO₂ are produced?

Correct Answer
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How many moles of Cl atoms are there in 65.2 g CHCl₃?

Correct Answer
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Correct Answer
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Correct Answer
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How many moles of O atoms are in 25.7 g of CaSO₄?

Correct Answer
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Phosphorus reacts with iodine as shown in the chemical reaction below.What is the percent yield of the reaction if 28.2 g PI₃ is obtained from the reaction of 48.0 g of I₂ with excess phosphorus? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Correct Answer
verified

A chemistry student determined the empirical formula for titanium sulfide (Ti_xS_y).To do so, she reacted titanium with excess sulfur in a crucible, and recorded the following data: What is the empirical formula of titanium sulfide?

Correct Answer
verified

Balance the following chemical equation: C₄H₁₀ + O₂ $\rarr$ CO₂ + H₂O

Correct Answer
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2C₄H₁₀ + 13 O...
View Answer

Correct Answer
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How many sulfur atoms are there in 21.0 g of Al₂S₃?

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

Correct Answer
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Calculate the percent composition by mass of sodium in Na₂CO₃.

Correct Answer
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Correct Answer
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What is the theoretical yield of PI₃ from the reaction of 27.0 g of P and 68.0 g of I₂? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Correct Answer
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