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CHEM 1211 Module Five Multiple Choice Retest 10 points

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

What is the molar mass of nitroglycerine, C3H5(ONO2)3?
a.
41.07 g/mol
b.
227.1 g/mol
c.
103.1 g/mol
d.
165.1 g/mol
e.
204 g/mole
 

 2. 

How many moles are there in 5.00 g of AgNO3?
a.
5.00 mol
b.
0.0294 mol
c.
8.49 mol
d.
0.00112 mol
e.
34.0 mol
 

 3. 

What is the mass percent of each element in chloroform, CHCl3?
a.
10.06% C, 60.24% H, 29.70% Cl
b.
20.00% C, 20.00% H, 60.00% Cl
c.
24.10% C, 3.11% H, 72.79% Cl
d.
33.87% C, 0.22% H, 65.91% Cl
e.
10.06% C, 0.84% H, 89.09% Cl
 

 4. 

Nitrogen and oxygen form an extensive series of oxides with the general formula NxOy. What is the empirical formula for an oxide that contains 63.65% nitrogen?
a.
N2O
b.
NO
c.
NO2
d.
N2O3
e.
N2O5
 

 5. 

Methane reacts with oxygen to form carbon dioxide and water.

CH4(g) + 2 O2(g) ® CO2(g) + 2 H2O(g)

All of the following statements concerning this reaction are correct EXCEPT
a.
two moles of water are formed per one mole of methane consumed.
b.
two molecules of oxygen are consumed per one mole of methane consumed.
c.
the combined mass of reactants consumed equals the mass of products formed.
d.
two grams of oxygen are consumed per each gram of carbon dioxide formed.
e.
three moles of gases are formed per each three moles of gases consumed.
 

 6. 

Sulfur dioxide may be prepared by the reaction of sulfur with oxygen gas according to the chemical equation below.

__ S8(s) + __ O2(g) ® __ SO2(g)

What are the respective coefficients when the equation is balanced with the smallest whole numbers?
a.
8, 8, 8
b.
2, 16, 8
c.
1, 8, 8
d.
2, 16, 16
e.
1, 2, 1
 

 7. 

The balanced equation for the complete combustion of benzene, C6H6, is
a.
C6H6(ª) + 12 H2O ® 6 CO2(g) + 15 H2(g)
b.
C6H6(ª) ® 6 C(s) + 3 H2(g)
c.
2 C6H6(ª) + 9 O2(g) ® 12 CO (g) + 6 H2O(g)
d.
C6H6(ª) + O2(g) ® CO2(g) + H2O(g)
e.
2 C6H6(ª) + 15 O2(g) ® 12 CO2(g) + 6 H2O(g)
 

 8. 

Dinitrogen trioxide, a blue solid, dissociates to form nitrogen monoxide and nitrogen dioxide gases. What mass of nitrogen dioxide is formed from the decomposition of 12.8 g of N2O3?
a.
5.05 g
b.
6.40 g
c.
7.75 g
d.
12.8 g
e.
21.1 g
 

 9. 

Dinitrogen pentaoxide reacts with water to produce nitric acid. Write a balanced chemical equation for this reaction.
a.
N2O5(s) + H2O(ª) ® 2 HNO3(aq)
b.
N2O3(s) + H2O(ª) ® 2 HNO2(aq)
c.
N2O4(s) + 2 H2O(ª) ® 2 H2NO3(aq)
d.
N2O5(s) + 2 H2O(ª) ® 2 H2NO3(aq)
e.
2 N2O5(s) + 6 H2O(ª) ® 4 H3NO3(aq)
 

 10. 

Iron reacts with hydrochloric acid to produce iron (II) chloride and hydrogen gas.

Fe(s) + 2 HCl(aq) ® FeCl2(aq) + H2(g)

How many moles of HCl will react with 3.5 moles of Fe?
a.
1.0 mol
b.
1.8 mol
c.
2.0 mol
d.
7.0 mol
e.
8.5
 

 11. 

The complete combustion of 2.0 moles of butane gas, C4H10, will
a.
consume 13 mol O2 and produce 8.0 mol H2O.
b.
consume 5.0 mol O2 and produce 13 mol CO2.
c.
consume 7.0 mol O2 and produce 8.0 mol CO2.
d.
produce 8 mol CO2 and 5.0 mol H2O.
e.
consume 13 mol O2 and produce 8.0 mol CO2.
 

 12. 

Aspirin is produced by the reaction of salicylic acid (M = 138.1 g/mol) and acetic anhydride (M = 102.1 g/mol).

C7H6O3(s) + C4H6O3(ª) ® C9H8O4(s) + C2H4O2(ª)

If you mix 10.0 grams of each reactant, how many grams of aspirin (M = 180.2 g/mol) can theoretically by obtained?
a.
7.30 g
b.
7.66 g
c.
9.32 g
d.
12.7 g
e.
13.0 g
 

 13. 

Aspirin is produced by the reaction of salicylic acid (M = 138.1 g/mol) and acetic anhydride (M = 102.1 g/mol).

C7H6O3(s) + C4H6O3(ª) ® C9H8O4(s) + C2H4O2(ª)

If 1.02 g of C9H8O4 (M = 180.2 g/mol) is produced from the reaction of 3.00 g C7H6O3 and 5.40 g C4H6O3, what is the percent yield?
a.
7.11%
b.
11.6%
c.
15.9%
d.
26.1%
e.
43.1%
 

 14. 

Under certain conditions the reaction below will proceed at 28.2% yield of NO. How many grams of NH3 must be reacted with excess oxygen to yield 125 g of NO?

4 NH3(g) + 5 O2(g) ® 4 NO(g) + 6 H2O(g)
a.
252 g
b.
277 g
c.
443 g
d.
518 g
e.
568 g
 

 15. 

Acetylsalicylic acid, commonly known as aspirin, has 9 carbon atoms, 8 hydrogen atoms, and 4 oxygen atoms per molecule. What is the molecular formula of aspirin?
a.
C9H8O4
b.
Ca9H8O2
c.
C9He8O4
d.
C9H8Ox4
e.
C9(HO4)2
 

Numeric Response
 

 16. 

In the blank below enter your score for Module five test so that your improvement may be added to your test score.

 



 
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