The % yield is a measure of the difference between the expected theoretical yield of a product and the actual amount obtained in an experiment
% Yield = actual yield / theoretical yield * 100%
Ex. Suppose 0.50 g of potassium carbonate reacts with excess hydrochloric acid. Calculate the % yield if 0.050g of water is produced
actual yield = 0.050 g of water
- calculate mole of the 2 compounds
- Use Stoichiometric way to calculate # of moles HO (l)
- Convert moles back to grams
- Use % Yield formula to find the percent yield
- Use Significant Digits and round
theoretical yield = 0.065190651 g of water
= 0.050 g / 0.065190651 g * 100% = 76.698132% = 77% (2 Significant Digits)
Homework (Grade 11 Chemistry) p.319 # 51 - 60 p.321 # 1 - 12