1. PERCENT YIELD tells you the efficiency of a reaction tells you the efficiency of a reaction formula: formula: % yield = actual yield x 100 theoretical yield theoretical yield

2. PERCENT YIELD theoretical yield – amt of prod predicted to form based on balanced equation theoretical yield – amt of prod predicted to form based on balanced equation actual yield – actual yield – obtained by doing an experiment obtained by doing an experiment varies according to temp, pressure, purity of reactants, and side rxns varies according to temp, pressure, purity of reactants, and side rxns

3. CALCULATE % YIELD Potassium carbonate reacts with HCl: write the balanced equation. K 2 CO 3(aq) + 2HCl (aq) → 2KCl (aq) + H 2 O + CO 2(g) When 45.8 g of K 2 CO 3 is added to an excess of HCl, 46.3 g KCl is recovered. Calc. % yield.

4. CALCULATE % YIELD K 2 CO 3(aq) + 2HCl (aq) → 2KCl (aq) + H 2 O + CO 2(g) 45.8g K 2 CO 3 x 1 mol K 2 CO 3 x 2 mol KCl … 138.21g K 2 CO 3 1 mol K 2 CO 3 x 74.55g KCl = 49.4 g KCl 1 mol KCl %yield = (46.3 g / 49.4 g) x 100 = 93.7%