Question 1

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

Accepted Answer

Question 2

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? 
___ CH3OH + ___ O2  →\rarr→  ___ CO2 + ___ H2O

Accepted Answer

A)  1
B)  2
C)  3
D)  7
E)  none of these F) C) and D)
G) A) and B)

Question 3

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 4

When balanced with smallest set of whole numbers, the coefficient of O2 in the following equation is __ C2H4 + __ O2  →\rarr→  __ CO2 + __ H2O

Accepted Answer

A)  1.
B)  2.
C)  3.
D)  4.
E)  6. F) A) and C)
G) A) and E)

Question 5

Commonly used gases in the laboratory 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 as needed. For example, nitrogen monoxide, NO(g), can be prepared in the lab by the following chemical reaction:
3Cu(s)+ 8HNO3(aq) $\rarr$2NO(g)+ 3Cu(NO3)2(aq)+ 4H2O(l)
If 15 g of copper metal was added to an aqueous solution containing 6.0 moles of HNO3, how many moles of NO(g)would be produced, assuming a 75% yield.

Accepted Answer

Question 6

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

Accepted Answer

A)  5.48 * 10-23 g
B)  33.0 g
C)  74.9 g
D)  1.24 * 10-22 g
E)  8.04 * 1021 gF) A) and B)
G) A) and C)

Question 7

How many molecules are there in 8.0 g of ozone, O3?

Accepted Answer

A)  3 molecules
B)  3.6 * 1024 molecules
C)  1.0 * 1023 molecules
D)  3.0 * 1023 molecules
E)  6.0 * 1023 moleculesF) B) and C)
G) B) and D)

Question 8

If 0.66 mole of a substance has a mass of 99 g, what is the molecular mass of the substance?

Accepted Answer

The answer of If 0.66 mole of a substance has...

Exam 3: Stoichiometry

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

Correct Answer
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If 0.66 mole of a substance has a mass of 99 g, what is the molecular mass of the substance?

Correct Answer
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What is the coefficient of O₂ when the following equation is properly balanced with the smallest set of whole numbers? _ CH₃OH + _ O₂ $\rarr$ _ CO₂ + _ H₂O

Correct Answer
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When balanced with smallest set of whole numbers, the coefficient of O₂ in the following equation is C₂H₄ + O₂ $\rarr$ CO₂ + H₂O

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

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

How many molecules are there in 8.0 g of ozone, O₃?

Correct Answer
verified

Correct Answer
verified

Exam 3: Stoichiometry

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

Correct AnswerverifiedShow Answer

If 0.66 mole of a substance has a mass of 99 g, what is the molecular mass of the substance?

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What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? ___ CH3OH + ___ O2 →\rarr→ ___ CO2 + ___ H2O

Correct AnswerverifiedShow Answer

When balanced with smallest set of whole numbers, the coefficient of O2 in the following equation is __ C2H4 + __ O2 →\rarr→ __ CO2 + __ H2O

Correct AnswerverifiedShow Answer

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

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

How many molecules are there in 8.0 g of ozone, O3?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct Answer
verified

Correct Answer
verified

What is the coefficient of O₂ when the following equation is properly balanced with the smallest set of whole numbers? _ CH₃OH + _ O₂ $\rarr$ _ CO₂ + _ H₂O

Correct Answer
verified

When balanced with smallest set of whole numbers, the coefficient of O₂ in the following equation is C₂H₄ + O₂ $\rarr$ CO₂ + H₂O

Correct Answer
verified

Correct Answer
verified

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

How many molecules are there in 8.0 g of ozone, O₃?

Correct Answer
verified

Correct Answer
verified