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grade 11 stoichiometry

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

1. 

What is the formula for dinitrogen trioxide?
a.
Ni2O3
c.
N2O6
b.
NO3
d.
N2O3
 

2. 

What is the percentage composition of chlorine in NaCl?
a.
35.45%
c.
60.7%
b.
50%
d.
64.5%
 

3. 

The empirical formula for a compound shows the symbols of the elements with subscripts indicating the
a.
actual numbers of atoms in a molecule.
b.
number of moles of the compound in 100 g.
c.
smallest whole-number ratio of the atoms.
d.
atomic masses of each element.
 

4. 

What is the empirical formula for a compound that is 53.3% O and 46.7% Si?
a.
SiO
c.
Si2O
b.
SiO2
d.
Si2O3
 

5. 

A compound contains 64 g of O and 4 g of H. What is the empirical formula for this compound?
a.
H2O
c.
HO2
b.
H2O2
d.
HO
 

6. 

A compound's empirical formula is CH3. If the formula mass is 30 amu, what is the molecular formula?
a.
CH3
c.
C2H6
b.
CH4
d.
C3H9
 

7. 

For the reaction 2H2 + O2® 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?
a.
2.0 mol
c.
12 mol
b.
6.0 mol
d.
18 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
 

8. 

For the reaction 2H2 + O2 ® 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?
a.
2.00 g
c.
54.0 g
b.
6.00 g
d.
108 g
 

9. 

For the reaction CH4 + 2O2 ® CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100. g of methane?
a.
6.23 mol
c.
12.5 mol
b.
10.8 mol
d.
25 mol
 

10. 

Which coefficients correctly balance the formula equation CaO + H2O ® Ca(OH)2?
a.
2, 1, 2
c.
1, 2, 1
b.
1, 2, 3
d.
1, 1, 1
 



 
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