Jocelyn M.
Melissa R.
Stoichiometry Review
Percent Yield and Theoretical Yield๎
Q: What is theoretical yield?
A: Theoretical yield is the maximum amount of product that can be
obtained in a chemical reaction. It is calculated from the limiting reactant.
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Q: What is percent yield?
A: Percent yield is the amount of product that could possibly be produced
in a given reaction. It is a ratio of the actual yield and the theoretical
yield multiplied by 100 to get a percent.
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Q: How do you find percent yield?
A: To find percent yield, you have to use the following formula:
% yield = ๎ actual yield ๎ x 100
theoretical yield
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Example #1: If 16.0 g of CaCO๎
3๎
are decomposed and 7.54 g of CaO are
obtained, what is the percent yield of CaO obtained? CaCO๎
3๎
โ CaO +
CO๎
2
1. Balance chemical equation. Because our equation is already
balanced, we move on to the second step.
2. We will need to convert the reactants and products and we can
only do that when we are starting with moles. So we make a
dimensional analysis table starting with what we know and going
straight to moles. We continue to finish the table.
16.0 g CaCO๎
3
1 mol CaCO๎
3
1 mol CaO
56.1 g CaO
100.1 g CaCO๎
3
1 mol
CaCO๎
3
1 mol CaO
= 8.97 g CaO
3. Always bring down diagonally your unit.
16.0 g CaCO๎
3
1 mol CaCO๎
3
1 mol CaO
56.1 g CaO
100.1 g CaCO๎
3
1 mol
CaCO๎
3
1 mol CaO
1๎
