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WorksheetsLimiting Reactants & Percent Yield
Total questions: 13
Worksheet time: 31mins
Name
Class
Date
1.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
2.
2H2 + O2 → 2H2O
How many moles of water can be produced if 8 moles H2 are used?
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
3.
The limiting reactant
a)
slows the reaction down
b)
is used up first
c)
is the reactant that is left over
d)
controls the speed of the reaction
4.
Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
a)
AlCl3
b)
Cl2
c)
Al
5.
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%
6.
In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?
a)
82%
b)
0.82%
c)
10.1 %
d)
100%
7.
When reacting Na with Cl2, we calculated that the theoretical yield should be 12.5 grams. Our actual yield was 13.0 grams. What is the percent yield?
a)
100%
b)
104%
c)
96%
d)
1.04
8.
What is the limiting reactant if 10 moles of NH3 react with 30.0 moles of NO?
4NH3 + 6NO ⟶ 5N2 + 6H2O
a)
NH3
b)
NO
c)
N2
d)
water
9.
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of starwberry jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 15 tablespoons of jelly, what is the limiting reactant?
a)
bread
b)
strawberry jelly
c)
peanut butter
10.
3. The reactant that is not completely used up in a chemical reaction is called the __________ .
a)
spectator reagent
b)
limiting reagent
c)
excess reagent
d)
catalyst
11.
7. The amount of product that actually forms when a chemical reaction is carried out in a laboratory is called the _________ yield.
a)
actual
b)
theoretical
c)
percent
12.
6. What is theoretical yield?
a)
the maximum amount of product that could be formed from a given amount of reactant.
b)
the amount of product that actually forms when a chemical reaction is carried out in a laboratory.
c)
the efficiency of a particular chemical reaction within the respective conditions.
d)
the reactant that is used up first in a reaction.
13.
True or False?
The actual yield is usually greater than the theoretical yield.
The actual yield is usually greater than the theoretical yield.
a)
False
b)
True
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