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Mastering Limiting Reagents in Chemical Reactions

Understand limiting reagents with examples & calculations in chemistry. Learn how to identify & calculate with excess reagents.

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Mastering Limiting Reagents in Chemical Reactions

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  1. Limiting Reagents Limiting reagent (limiting reactant) – the reactant in a chemical reaction that limits the amount of product can be formed. The reaction stops when all of the limiting reagent is consumed (used up). Excess reagent (excess reactant) – the reactant that is not completely used up in a chemical reaction.

  2. Limiting Reagents example 1: iron reacts with water as follows: Fe + H2O  Fe3O4 + H2 If 9.5 moles of water react with 1.65 moles of iron, what is the limiting reagent?

  3. Limiting Reagents example 1: iron reacts with water as follows: Fe + H2O  Fe3O4 + H2 If 9.5 moles of water react with 1.65 moles of iron, how many moles of hydrogen are produced?

  4. Limiting Reagents example 2: consider the following reaction: Mg + O2 MgO If 31.5 grams of oxygen reacts with 60.0 grams of magnesium, what is the limiting reagent?

  5. Limiting Reagents example 2: consider the following reaction: Mg + O2 MgO If 31.5 grams of oxygen reacts with 60.0 grams of Mg, how many grams of MgO are produced?

  6. Limiting Reagents example 3: KCl+ F2 KF + Cl2 If 282 grams of KCl combines with 123 grams of F2 gas, which substance is the limiting reagent?

  7. Limiting Reagents example 3: KCl+ F2 KF + Cl2 If 282 grams of KCl combines with 123 grams of F2 gas, how many grams of Cl2 are formed?

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