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WorksheetsStoichiometry
Total questions: 20
Worksheet time: 3hrs 58mins
Name
Class
Date
1.
What is the molar mass of Zn(C2H3O2)2
a)
392.8g/mol
b)
142.9g/mol
c)
361g/mol
d)
183.5 g/mol
2.
Balance this reaction: ____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF
a)
1,1,1,1
b)
1,2,1,1
c)
2,1,1,2
d)
2,1,2,1
3.
How many molecules are in 1 mole of CO2?
a)
4.6 molecules
b)
4.6 grams
c)
6.02 x 10 23 molecules
d)
1.806x 10 24 atoms
4.
The first step in stoichiometry is to
a)
Determine a balanced equation
b)
convert grams to moles
c)
convert grams to liters
d)
use the mole ratio
5.
What is stoichiometry?
a)
The study of how the quantities of reactants and products are related in chemical reactions
b)
The study of the speed of reactions
c)
The study of how chemical reactions occur
d)
The study of types of reactions
6.
N2 + 3H2 → 2NH3
What is the mole ratio between Nitrogen and Ammonia in the above reaction?
What is the mole ratio between Nitrogen and Ammonia in the above reaction?
a)
1 moles NH3 / 2 moles N2
b)
2 moles NH3 / 1 moles N2
c)
2 moles N2 / 3 moles NH3
d)
1 moles N2 / 3 moles NH3
7.
B2H6 + 3 O2 → 2 HBO2 + 2 H2O
What mass of O2 will be needed to burn 36.1 g of B2H6?
What mass of O2 will be needed to burn 36.1 g of B2H6?
a)
13.8 g O2
b)
3.86 mol of O2
c)
124 g O2
8.
When 12 moles of O2 reacts with 1.1 mole of C10H8 what is the limiting reactant? C10H8 + 12 O2 → 10 CO2 + 4 H2O
a)
Oxygen
b)
C10H8
c)
Water
d)
Carbon Dioxide
9.
2Na + 2H2O → 2NaOH + H2
How many grams of hydrogen are produced if 120 g of Na are available?
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
10.
If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
a)
theoretical yield
b)
mole ratio
c)
actual yield
d)
percentage yield
11.
When does a chemical reaction stop?
a)
When the lab is finished
b)
When the excess reactant is used up
c)
When the limiting reactant is used up
d)
Chemical reactions never stop
12.
What is the chemical formula for sodium hydroxide?
a)
NaH2
b)
SO2
c)
NaOH
d)
OHS
13.
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
Actual yield = 62g
Calculate the percent yield.
a)
1.16%
b)
116%
c)
85%
d)
76%
14.
2Fe2O3 + C → Fe + 3CO2
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2? (Hint: calculate theoretical yield of CO2 first)
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2? (Hint: calculate theoretical yield of CO2 first)
a)
15.8%
b)
209.2%
c)
6435%
d)
15.5
15.
2 Al + 3 Cl2 →2 AlCl3.
If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
a)
AlCl3
b)
Cl2
c)
Al
16.
__N2 + __H2 → __NH3
How many grams of ammonia (NH3) can be produced from the reaction of 28 g of nitrogen gas and 25 grams of hydrogen gas?
How many grams of ammonia (NH3) can be produced from the reaction of 28 g of nitrogen gas and 25 grams of hydrogen gas?
a)
43 g
b)
34 moles
c)
25 grams
d)
34 grams
17.
__SO2 + __PCl5 → __SOCl2 + __POCl3
How many grams of SOCl2 is produced when 16.2g SO2 react with 13.7g PCl5?
How many grams of SOCl2 is produced when 16.2g SO2 react with 13.7g PCl5?
a)
7.87g
b)
30.1g
c)
26.4g
d)
19.8g
18.
What goes in the yellow box? (Under Sulfur in the C row)
a)
0.136 mol
b)
0.270 mol
c)
0.068 mol
d)
XS
19.
What goes in the red box? (Under Sulfur in the A row)
a)
0.136 mol
b)
0.270 mol
c)
0.134 mol
d)
XS
20.
How many grams of excess are there left?
a)
7.60 g Fe
b)
4.30 g S
c)
0.134 g S
d)
0.270 g S
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