Question 1

How many atoms of nitrogen are in 10 g of NH4NO3?

Accepted Answer

A)   2
B)   3.0 × 1023 
C)   1.8
D)   3.5
E)   1.5 × 1023

Question 2

A compound was found to contain 90.6% lead (Pb) and 9.4% oxygen. The empirical formula for this compound is .

Accepted Answer

The answer of A compound was found to contain 90.6%...

Question 3

The combustion of carbon disulfide in the presence of excess oxygen yields carbon dioxide and sulfur dioxide:
  
The combustion of 15 g of CS2 in the presence of excess oxygen yields g of SO2.

Accepted Answer

Question 4

What is the maximum mass in grams of NH3 that can be produced by the reaction of 1.0 g of N2 with 3.0 g of H2 via the equation below? 3 that can be produced by the reaction of 1.0 g of N2 with 3.0 g of H2 via the equation below?   A)  0.61 B)  2.0 C)  17 D)  1.2 E)  4.0" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   0.61
B)   2.0
C)   17
D)   1.2
E)   4.0

Question 5

A compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass. What is the empirical formula of the compound?

Accepted Answer

A)   CH4 
B)   C2H4 
C)   CH2 
D)   C86H14 
E)   C4H8

Question 6

How many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide?

Accepted Answer

A)   1.80 × 1024
B)   6.02 × 1024
C)   6.02 × 1023
D)   1.08 × 1023
E)   1.08 × 1024

Question 7

Calculate the percentage by mass of chlorine in PtCl2(NH3) 2.

Accepted Answer

A)   23.63
B)   12.53
C)   25.05
D)   11.82
E)   18.09

Question 8

The combustion of propane (C3H8)  produces CO2 and H2O:
3H8)  produces CO2 and H2O:   The reaction of 2.5 mol of O2 will produce mol of H2O. A)  4.0 B)  3.0 C)  2.5 D)  2.0 E)  1.0" class="answers-bank-image d-inline" rel="preload" >
The reaction of 2.5 mol of O2 will produce mol of H2O.

Accepted Answer

A)   4.0
B)   3.0
C)   2.5
D)   2.0
E)   1.0

Question 9

How many moles of carbon dioxide are there in 52.06 g of carbon dioxide?

Accepted Answer

A)   0.8452
B)   1.183
C)   6.022 × 1023
D)   3.134 × 1025
E)   8.648 × 1023

Question 10

A great deal of the carbon dioxide produced by the combustion of fossil fuels is absorbed into the oceans.

Accepted Answer

A) True 
 B)False

Question 11

A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be _ _.

Accepted Answer

A)   N2O4
B)   N2O
C)   NO2
D)   NO
E)   either NO2 or N2O4

Question 12

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia:
  
A 9.3- g sample of hydrogen requires

Accepted Answer

The answer of Under appropriate conditions, nitrogen and hydrogen undergo...

Question 13

Of the reactions below, which one is a decomposition reaction?

Accepted Answer

A)   2CH4  + 4O2  -2CO2  + 4H2O
B)   2Mg + O2 - 2MgO
C)   Cd(NO3) 2 + Na2S - CdS + 2NaNO3
D)   2N2 + 3H2 - 2NH3
E)   NH4Cl - NH3 + HCl

Question 14

Which one of the following is not true concerning automotive air bags?

Accepted Answer

A)   The gas used for inflating them is oxygen
B)   A gas is produced when the air bag activates.
C)   They are loaded with sodium azide initially
D)   The two products of the decomposition reaction are sodium and nitrogen
E)   They are inflated as a result of a decomposition reaction

Question 15

A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is 60.05 amu. The molecular formula of this compound is _ _.

Accepted Answer

A)   C2H3O4 
B)   CHO2 
C)   C2H4O2 
D)   C2H2O4 
E)   CH2O

Question 16

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water?

Accepted Answer

A)   0.0485
B)   0.219
C)   0.102
D)   0.0162
E)   0.204

Question 17

When the following equation is balanced, the coefficient of O2 is _ . 2 is _ .   A)  4 B)  3 C)  2 D)  1 E)  5" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   4
B)   3
C)   2
D)   1
E)   5

Question 18

There are _ sulfur atoms in 25 molecules of C4H4S2.

Accepted Answer

A)   3.0 × 1025
B)   50
C)   6.02 × 1023
D)   1.5 × 1025
E)   4.8 × 1025

Question 19

Calculate the percentage by mass of hydrogen in PtCl2(NH3) 2.

Accepted Answer

A)   1.008
B)   0.034
C)   2.016
D)   0.672
E)   1.558

Question 20

Carbon dioxide called a greenhouse gas because bacterial degradation of fertilizers in a greenhouse environment produce large quantities of carbon dioxide.

Accepted Answer

A) True 
 B)False

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is 60.05 amu. The molecular formula of this compound is _ _.

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Calculate the percentage by mass of hydrogen in PtCl2(NH3) 2.

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When the following equation is balanced, the coefficient of O2 is _ .

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How many moles of carbon dioxide are there in 52.06 g of carbon dioxide?

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The combustion of carbon disulfide in the presence of excess oxygen yields carbon dioxide and sulfur dioxide: The combustion of 15 g of CS2 in the presence of excess oxygen yields g of SO2.

Correct AnswerverifiedShow Answer

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: A 9.3- g sample of hydrogen requires

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Which one of the following is not true concerning automotive air bags?

Correct AnswerverifiedShow Answer

The combustion of propane (C3H8) produces CO2 and H2O: The reaction of 2.5 mol of O2 will produce mol of H2O.

Correct AnswerverifiedShow Answer

A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be _ _.

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There are _ sulfur atoms in 25 molecules of C4H4S2.

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Carbon dioxide called a greenhouse gas because bacterial degradation of fertilizers in a greenhouse environment produce large quantities of carbon dioxide.

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A compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass. What is the empirical formula of the compound?

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Calculate the percentage by mass of chlorine in PtCl2(NH3) 2.

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How many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide?

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What is the maximum mass in grams of NH3 that can be produced by the reaction of 1.0 g of N2 with 3.0 g of H2 via the equation below?

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Of the reactions below, which one is a decomposition reaction?

Correct AnswerverifiedShow Answer

A compound was found to contain 90.6% lead (Pb) and 9.4% oxygen. The empirical formula for this compound is .

Correct AnswerverifiedShow Answer

A great deal of the carbon dioxide produced by the combustion of fossil fuels is absorbed into the oceans.

Correct AnswerverifiedShow Answer

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water?

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How many atoms of nitrogen are in 10 g of NH4NO3?

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Calculate the percentage by mass of hydrogen in PtCl₂(NH₃) ₂.

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When the following equation is balanced, the coefficient of O₂is _ .

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The combustion of carbon disulfide in the presence of excess oxygen yields carbon dioxide and sulfur dioxide: The combustion of 15 g of CS₂in the presence of excess oxygen yields g of SO₂.

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The combustion of propane (C₃H₈) produces CO₂and H₂O: The reaction of 2.5 mol of O₂will produce mol of H₂O.

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There are _ sulfur atoms in 25 molecules of C₄H₄S₂.

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Calculate the percentage by mass of chlorine in PtCl₂(NH₃) ₂.

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What is the maximum mass in grams of NH₃that can be produced by the reaction of 1.0 g of N₂ with 3.0 g of H₂via the equation below?

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How many atoms of nitrogen are in 10 g of NH₄NO₃?

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