Limiting and Excess Reactants

Front

What is a limiting reactant?

Back

The limiting reactant is the substance that is used up first in a chemical reaction, determining the amount of product formed.

Front

What happens to the limiting reactant during a chemical reaction?

Back

The limiting reactant is completely consumed, while other reactants may remain.

Front

Define excess reactant.

Back

An excess reactant is a substance that remains after a chemical reaction has completed.

Front

How do you identify the limiting reactant in a reaction?

Back

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

Front

What is the mole ratio in a chemical reaction?

Back

The mole ratio is the ratio of moles of one substance to the moles of another substance in a balanced chemical equation.

Front

Given the reaction 4NH3 + 6NO -> 5N2 + 6H2O, if you have 10 moles of NH3 and 30 moles of NO, which is the limiting reactant?

Back

NH3 is the limiting reactant.

Front

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

Back

O2 is the limiting reactant.

Front

What is the significance of the limiting reactant in a chemical reaction?

Back

The limiting reactant determines the maximum amount of product that can be formed in the reaction.

Front

If 12 moles of O2 react with 1.1 moles of C10H8 in the reaction C10H8 + 12 O2 -> 10 CO2 + 4 H2O, what is the limiting reactant?

Back

O2 is the limiting reactant.

Front

What is stoichiometry?

Back

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced equation.