How far away you are from a theoretical or “actual” value.
Stoichiometry tells us the theoretical yield of a chemical reaction. The actual yield of a chemical reaction is usually less. ◦ Incomplete reactions ◦ Impure reactants ◦ Side reactions occurring ◦ Reversible reactions
If 5.50g of hydrogen reacts with nitrogen to form 20.4g of ammonia, what is the percent yield? N 2 (g) + H 2 (g) NH 3 (g) 32
31.2g NH 3 (Theoretical)
65.4% NH 3
Actual yield: What you actually get. ◦ Results from lab Theoretical Yield: What you should get. ◦ Need to use stoichiometry. Actual Yield is always a product. ◦ Yield(ing) product forms