Question 1

The quantity of product that is calculated to form when all of the limiting reagent reacts is called the actual yield.

Accepted Answer

A) True 
 B)False

Question 2

When the following equation is balanced, the coefficient of Al is .

Accepted Answer

A)   3
B)   1
C)   5
D)   4
E)   2F) All of the above
G) B) and E)

Question 3

The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O:
2 and H2O:   The combustion of 43.9 g of ammonia produces g of NO2. A)  2.58 B)  178 C)  43.9 D)  0.954 E)  119" class="answers-bank-image d-inline" rel="preload" >
The combustion of 43.9 g of ammonia produces g of NO2.

Accepted Answer

A)   2.58
B)   178
C)   43.9
D)   0.954
E)   119F) C) and E)
G) None of the above

Question 4

Complete and balance the following reaction, given that elemental rubidium reacts with elemental sulfur to form Rb2S (s).
Na (s) + S (s) -

Accepted Answer

Question 5

When the following equation is balanced, the coefficient of H2 is _ . 2 is _ .   A)  4 B)  3 C)  2 D)  0 E)  1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   4
B)   3
C)   2
D)   0
E)   1F) B) and C)
G) None of the above

Question 6

The reaction used to inflate automobile airbags _.

Accepted Answer

A)   is a decomposition reaction
B)   produces sodium gas
C)   violates the law of conservation of mass
D)   is a combination reaction
E)   is a combustion reactionF) D) and E)
G) All of the above

Question 7

When the following equation is balanced, the coefficient of Al2O3 is _ . 2O3 is _ .   A)  5 B)  3 C)  4 D)  1 E)  2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   5
B)   3
C)   4
D)   1
E)   2F) A) and B)
G) A) and C)

Question 8

Which one of the following substances is the product of this combination reaction? 
Al (s)  + I2 (s)  -

Accepted Answer

A)   AlI
B)   AlI3 
C)   Al2I3 
D)   Al3I2 
E)   AlI2F) None of the above
G) B) and C)

Question 9

A sample of C3H8O that contains 200 molecules contains _ carbon atoms.

Accepted Answer

A)   4.01 × 1025
B)   1.20 × 1026
C)   600
D)   200
E)   3.61 × 1026F) B) and C)
G) A) and C)

Question 10

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide:
2 is recovered. What is the percent yield in this experiment? A)  7.19 B)  122 C)  81.9 D)  1.22 E)  92.4" class="answers-bank-image d-inline" rel="preload" >
In a particular experiment, a 5.00- g sample of CaO is reacted with excess water and 6.11 g of Ca(OH) 2 is recovered. What is the percent yield in this experiment?

Accepted Answer

A)   7.19
B)   122
C)   81.9
D)   1.22
E)   92.4F) C) and D)
G) A) and B)

Question 11

The formula weight of silver chromate (Ag2CrO4)  is _ amu.

Accepted Answer

A)   159.87
B)   175.87
C)   223.87
D)   331.73
E)   339.86F) A) and E)
G) D) and E)

Question 12

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia:
2 requires g of H2 for complete reaction. A)  17.2 B)  0.76 C)  1.2 D)  1.5 E)  0.51" class="answers-bank-image d-inline" rel="preload" >
A 7.1- g sample of N2 requires g of H2 for complete reaction.

Accepted Answer

A)   17.2
B)   0.76
C)   1.2
D)   1.5
E)   0.51F) C) and E)
G) A) and D)

Question 13

The formula weight of calcium nitrate (Ca(NO3) 2)  is _ amu.

Accepted Answer

A)   150.1
B)   204.2
C)   102.1
D)   116.1
E)   164.0F) A) and B)
G) B) and E)

Question 14

When the following equation is balanced, the coefficient of water is _.

Accepted Answer

A)   5
B)   4
C)   1
D)   2
E)   3F) C) and D)
G) A) and B)

Question 15

When the following equation is balanced, the coefficient of dinitrogen pentoxide is .

Accepted Answer

A)   2
B)   1
C)   5
D)   3
E)   4F) All of the above
G) None of the above

Question 16

When the following equation is balanced, the coefficient of H2O is _ . 2O is _ .   A)  4 B)  1 C)  5 D)  3 E)  2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   4
B)   1
C)   5
D)   3
E)   2F) A) and B)
G) B) and C)

Question 17

Of the reactions below, which one is not a combination reaction?

Accepted Answer

A)   2CH4  + 4O2  -2CO2  + 4H2O
B)   CaO + H2O - Ca(OH) 2
C)   2Mg + O2 - 2MgO
D)   C + O2 - CO2
E)   2N2 + 3H2 - 2NH3F) None of the above
G) A) and E)

Question 18

The combustion of propane (C3H8)  in the presence of excess oxygen yields CO2 and H2O:
3H8)  in the presence of excess oxygen yields CO2 and H2O:   When 2.5 mol of O2 are consumed in their reaction, mol of CO2 are produced. A)  2.5 B)  5.0 C)  3.0 D)  1.5 E)  6.0" class="answers-bank-image d-inline" rel="preload" >
When 2.5 mol of O2 are consumed in their reaction, mol of CO2 are produced.

Accepted Answer

A)   2.5
B)   5.0
C)   3.0
D)   1.5
E)   6.0F) C) and D)
G) A) and B)

Question 19

Combustion of a 1.031- g sample of a compound containing only carbon, hydrogen, and oxygen produced 2.265 g of CO2 and 1.236 g of H2O. What is the empirical formula of the compound?

Accepted Answer

A)   C3H5O
B)   C3H8O
C)   C3H9O3 
D)   C6H16O2 
E)   C3H6O3F) C) and D)
G) B) and D)

Question 20

A compound is composed of only C, H, and O. The combustion of a 0.519- g sample of the compound yields 1.24 g of CO2 and 0.255 g of H2O. What is the empirical formula of the compound?

Accepted Answer

A)   C6H6O
B)   CH3O
C)   C3H3O
D)   C2H6O2 
E)   C2H6O5F) A) and E)
G) A) and D)

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

When the following equation is balanced, the coefficient of water is _.

Correct AnswerverifiedShow Answer

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: In a particular experiment, a 5.00- g sample of CaO is reacted with excess water and 6.11 g of Ca(OH) 2 is recovered. What is the percent yield in this experiment?

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The formula weight of calcium nitrate (Ca(NO3) 2) is _ amu.

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When the following equation is balanced, the coefficient of dinitrogen pentoxide is .

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When the following equation is balanced, the coefficient of Al is .

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The reaction used to inflate automobile airbags _.

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Which one of the following substances is the product of this combination reaction? Al (s) + I2 (s) -

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The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O: The combustion of 43.9 g of ammonia produces g of NO2.

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Of the reactions below, which one is not a combination reaction?

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When the following equation is balanced, the coefficient of H2 is _ .

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The combustion of propane (C3H8) in the presence of excess oxygen yields CO2 and H2O: When 2.5 mol of O2 are consumed in their reaction, mol of CO2 are produced.

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A sample of C3H8O that contains 200 molecules contains _ carbon atoms.

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The quantity of product that is calculated to form when all of the limiting reagent reacts is called the actual yield.

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When the following equation is balanced, the coefficient of H2O is _ .

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Complete and balance the following reaction, given that elemental rubidium reacts with elemental sulfur to form Rb2S (s). Na (s) + S (s) -

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The formula weight of silver chromate (Ag2CrO4) is _ amu.

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Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: A 7.1- g sample of N2 requires g of H2 for complete reaction.

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When the following equation is balanced, the coefficient of Al2O3 is _ .

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Combustion of a 1.031- g sample of a compound containing only carbon, hydrogen, and oxygen produced 2.265 g of CO2 and 1.236 g of H2O. What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

A compound is composed of only C, H, and O. The combustion of a 0.519- g sample of the compound yields 1.24 g of CO2 and 0.255 g of H2O. What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

Correct Answer
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Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: In a particular experiment, a 5.00- g sample of CaO is reacted with excess water and 6.11 g of Ca(OH) ₂is recovered. What is the percent yield in this experiment?

Correct Answer
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The formula weight of calcium nitrate (Ca(NO₃) ₂) is _ amu.

Correct Answer
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Which one of the following substances is the product of this combination reaction? Al (s) + I₂(s) -

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The combustion of ammonia in the presence of excess oxygen yields NO₂and H₂O: The combustion of 43.9 g of ammonia produces g of NO₂.

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When the following equation is balanced, the coefficient of H₂is _ .

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The combustion of propane (C₃H₈) in the presence of excess oxygen yields CO₂and H₂O: When 2.5 mol of O₂are consumed in their reaction, mol of CO₂are produced.

Correct Answer
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A sample of C₃H₈O that contains 200 molecules contains _ carbon atoms.

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When the following equation is balanced, the coefficient of H₂O is _ .

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Complete and balance the following reaction, given that elemental rubidium reacts with elemental sulfur to form Rb₂S (s). Na (s) + S (s) -

Correct Answer
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The formula weight of silver chromate (Ag₂CrO₄) is _ amu.

Correct Answer
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Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: A 7.1- g sample of N₂requires g of H₂for complete reaction.

Correct Answer
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When the following equation is balanced, the coefficient of Al₂O₃is _ .

Correct Answer
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Combustion of a 1.031- g sample of a compound containing only carbon, hydrogen, and oxygen produced 2.265 g of CO₂and 1.236 g of H₂O. What is the empirical formula of the compound?

Correct Answer
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A compound is composed of only C, H, and O. The combustion of a 0.519- g sample of the compound yields 1.24 g of CO₂and 0.255 g of H₂O. What is the empirical formula of the compound?

Correct Answer
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