A general way to determine which reactant is limiting is ...

The theoretical yield is what you calculate from the balanced equation using stoichiometry. The actual yield is what you actually get when you do the reaction. Example, if 1.20 mol propane reacted with 2.80 mol 02 (see above), and 50.0 g C02 was obtained, what was the percent yield? 50.0 g is the actual yield of C02 The theoretical yield was 73.9 g ................
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