Chemistry Tutorial
Percent Yield Calculation
Intro
When given the mass of one reactant and the mass of the final product, we can use stoichiometry to find the percent yield of the product.
Sample Problem
If 120.7g phosphorous pentachloride (molar mass=208.2g/mol) is formed when 64.2g of chlorine gas (molar mass=70.90g/mol) reacts with excess phosphorous trichloride, calculate the percent yield for the reaction.
Solution
Step 1: write out the balanced equation
= PCl3 + Cl2 -> PCl5
Step 2: convert from grams Cl2 to grams PCl5
= 64.2g x 1mol/70.90g x 1molPC5/1molCl2 x 208.2g/1mol = 188.525g
Step 3: calculate percent yield
= 120.7g/188.525g x 100% = 64.02%
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