Stoichiometry - Percent Yield

Theoretical yield of a reaction is the amount of products that should be formed. Percent yield is like a measure of success. The equation for percent yield is:

% yield = experimental x 100
                  theoretical
Example:

• The production of Urea CO(HN2)2 is given by the equation 
• 2 NH3 + CO2 -> CO(NH2)2 + H2O

1. If 47.7g of Urea are produced, determine the theoretical (predicted) yield of CO2
2. What is the % yield of CO2 if 12.0g is produced?

1) 47.7g x 1 mol x 1 x 44,0g = 35g
                  60g     1    1 mol

2) 12g x 100 = 34%
    35g