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stoichiometry_1

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

1. 

A determination of the masses and number of moles of sulfur and oxygen in the compound sulfur dioxide would be studied in
a.
reaction stoichiometry.
c.
chemical equilibrium.
b.
chemical kinetics.
d.
composition stoichiometry.
 

2. 

Each of the four types of reaction stoichiometry problems requires using a
a.
table of bond energies.
c.
Lewis structure.
b.
chart of electron configurations.
d.
mole ratio.
 

3. 

In the chemical equation wA + xB ® yC + zD, if one knows the mass of A and the molar masses of A, B, C, and D, one can determine
a.
the mass of any of the reactants or products.
b.
the mass of B only.
c.
the total mass of C and D only.
d.
the total mass of A and B only.
 

4. 

In the reaction N2 + 3H2 ® 2NH3, what is the mole ratio of nitrogen to ammonia?
a.
1:1
c.
1:3
b.
1:2
d.
2:3
 

5. 

In the reaction 2Al2O3 ® 4Al + 3O2, what is the mole ratio of aluminum to oxygen?
a.
10:6
c.
2:3
b.
3:4
d.
4:3
 

6. 

In the reaction 2H2 + O2 ® 2H2O, what is the mole ratio of oxygen to water?
a.
1:2
c.
8:1
b.
2:1
d.
1:4
 

7. 

In the reaction N2 + 3H2 ® 2NH3, what is the mole ratio of hydrogen to ammonia?
a.
1:1
c.
3:2
b.
2:1
d.
6:8
 

8. 

The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) ® 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?
a.
1.0 mol
c.
3.0 mol
b.
2.0 mol
d.
6.0 mol
 
 
Element
Symbol
Atomic mass
Bromine
Br
      79.904
Calcium
Ca
      40.078
Carbon
C
      12.011
Chlorine
Cl
      35.4527
Cobalt
Co
      58.933 20
Copper
Cu
      63.546
Fluorine
F
      18.998 4032
Hydrogen
H
      1.007 94
Iodine
I
      126.904
Iron
Fe
      55.847
Lead
Pb
      207.2
Magnesium
Mg
      24.3050
Mercury
Hg
      200.59
Nitrogen
N
      14.006 74
Oxygen
O
      15.9994
Potassium
K
      39.0983
Sodium
Na
      22.989 768
Sulfur
S
      32.066
 

9. 

For the reaction 2Na + 2H2O ® 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of water?
a.
40. g
c.
120 g
b.
80. g
d.
240 g
 

10. 

For the reaction SO3 + H2O ® H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid?
a.
80.0 g
c.
240. g
b.
160. g
d.
320. g
 

11. 

For the reaction 2Na + Cl2 ® 2NaCl, how many grams of sodium chloride can be produced from 500. g each of sodium and chlorine?
a.
112 g
c.
409 g
b.
319 g
d.
825 g
 

12. 

For the reaction SO3 + H2O ® H2SO4, how many grams of sulfuric acid can be produced from 200. g of sulfur trioxide and 100. g of water?
a.
100. g
c.
245 g
b.
200. g
d.
285 g
 



 
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