# Bay State College Boston Limiting & Excess Reagent Exercises

Guide: Stoichiometry: Reaction Yields Adapted from LumenCourses Determine the theoretical yield of the product i…

C5H12 + 8 O2 ? 5 CO2 + 6 H2O

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• What is the percent yield of CO2 product, if the expected amount of product was 400 grams, but only 135 grams was actually produced during the experiment?
• If 200 grams of C5H12 reacts with 350 grams of O2, what is the maximum amount of H2O product that can be produced?Which substance is the limiting reactant or reagent? Which substance is the excess reactant or reagent? How much excess reactant remains (unused amount) after the completion of the chemical reaction?

4 FeS + 7 O2 ? 2 Fe2O3 + 4 SO2

• What is the percent yield of SO2 product, if the expected amount of product was 80 grams, but only 24 grams was actually produced in a laboratory?
• If 75.2 grams of FeS reacts with 192 grams of O2, what is the maximum amount of Fe2O3 product that can be produced?Which substance is the limiting reactant or reagent? Which substance is the excess reactant or reagent? How much excess reactant remains (unused amount) after the completion of the chemical reaction?

B2Br6 + 6 HNO3 ? 2 B(NO3)3 + 6 HBr

• What is the percent yield of HBr product, if the calculated amount of product was 615 grams, but only 108 grams was measured during an experiment?
• If 325 grams of B2Br6 reacts with 561 grams of HNO3, what is the maximum amount of B(NO3)3 product that can be produced?Which substance is the limiting reactant or reagent? Which substance is the excess reactant or reagent? How much excess reactant remains (unused amount) after the completion of the chemical reaction?

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