WorksheetsStoichiometry/LR
Total questions: 10
Worksheet time: 2hrs 6mins
Name
Class
Date
1.
What is a limiting reactant?
a)
the reactant that determines how much product can be made
b)
the reactant that is in excess
c)
the product that you can make the most of
d)
the amount of reactants that react with each other
2.
What is the limiting reactant if 10 moles of NH3 react with 30.0 moles of NO?
4NH3+6NO --> 5N2 + 6H2O
4NH3+6NO --> 5N2 + 6H2O
a)
NH3
b)
NO
c)
N2
d)
water
3.
How many grams of water can be produced by the reaction of 2.4 mol C2H2 with 7.4 mol O2?
a. 2C2H2 + 5O2 --> 4CO2 + 2H20
b. 2C2H2 + 5O2 --> 4CO2 + 2H20
a. 2C2H2 + 5O2 --> 4CO2 + 2H20
b. 2C2H2 + 5O2 --> 4CO2 + 2H20
a)
43.2 g H2O
b)
35.8 g H2O
c)
17.8 g H2O
d)
None of the above
4.
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
5.
Fe (s) + S (l) --> FeS (s)
In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?
In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?
a)
14.8 g
b)
12.2 g
c)
13.7 g
d)
19.9 g
6.
Appriximately how many grams of MgCl2 will be produced when 6.00 g HCl combines with 5.00 g Mg?
a. Mg + 2HCl --> MgCl2 + H2
b. a. Mg + 2HCl --> MgCl2 + H2
a. Mg + 2HCl --> MgCl2 + H2
b. a. Mg + 2HCl --> MgCl2 + H2
a)
19.6 g
b)
39.4 g
c)
7.72 g
d)
1.08 g
7.
4 Al + 3 O2 –> 2 Al2O3 How much aluminum would be needed to completely react with 45 grams of O2?
a)
1.05 moles
b)
3.75 moles
c)
1.875 grams
d)
1.875 moles
8.
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
9.
Use the equation
2Al + 3Cl2 ---> 2AlCl3.
If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
2Al + 3Cl2 ---> 2AlCl3.
If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
a)
AlCl3
b)
Cl2
c)
Al
10.
What is the percent yield of the following reaction if 145g of P2O5 reacts with 40 grams of water, but you only collected 112 grams of phosphoric acid? 3 H2O + P2O5 -> 2H3PO4
a)
80%
b)
85%
c)
77%
d)
58%
100 %
