Limiting Reactants

Front

What is a limiting reactant?

Back

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product that can be formed.

Front

How do you identify the limiting reactant in a reaction?

Back

To identify the limiting reactant, compare the mole ratio of the reactants used in the reaction to the mole ratio in the balanced equation.

Front

In the reaction 2 Al + 3 Cl2 -> 2 AlCl3, if you have 2 moles of Al and 2 moles of Cl2, which is the limiting reactant?

Back

Cl2 is the limiting reactant.

Front

In the reaction P4 + 3O2 -> P4O6, if you have 12 moles of P4 and 15 moles of O2, which is the limiting reactant?

Back

O2 is the limiting reactant.

Front

What is the theoretical yield?

Back

The theoretical yield is the maximum amount of product that can be produced from a given amount of reactants, based on stoichiometric calculations.

Front

In the reaction 4NH3 + 6NO -> 5N2 + 6H2O, how much water can be produced from 8 moles of NH3 and 6 moles of NO?

Back

6 moles of water can be produced.

Front

What happens to the limiting reactant during a chemical reaction?

Back

The limiting reactant is used up first, determining the amount of product formed.

Front

What is excess reactant?

Back

The excess reactant is the substance that remains after the limiting reactant is completely consumed in a chemical reaction.

Front

In a balanced chemical equation, what does the coefficient represent?

Back

The coefficient represents the number of moles of each substance involved in the reaction.

Front

If 2 moles of A react with 3 moles of B, how many moles of A are needed to react with 9 moles of B?

Back

6 moles of A are needed to react with 9 moles of B.