Stoichiometry and Limiting Reactants

Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

What is a limiting reactant?

Back

A 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 calculate the theoretical yield?

Back

The theoretical yield is calculated based on the balanced chemical equation and the amount of limiting reactant available.

Front

What is percent yield?

Back

Percent yield is the ratio of the actual yield to the theoretical yield, multiplied by 100. It indicates the efficiency of a reaction.

Front

What is the molar volume of a gas at STP?

Back

The molar volume of a gas at standard temperature and pressure (STP) is 22.4 liters per mole.

Front

How do you determine the number of moles from grams?

Back

To determine the number of moles from grams, use the formula: moles = mass (g) / molar mass (g/mol).

Front

What is the balanced equation for the reaction of aluminum and chlorine?

Back

The balanced equation is: 2 Al + 3 Cl2 → 2 AlCl3.

Front

If 2.0 moles of Al and 2.0 moles of Cl2 are reacted, how do you find the limiting reactant?

Back

Compare the mole ratio from the balanced equation to the moles available. The reactant that produces less product is the limiting reactant.

Front

How many moles of Fe can be produced from 6.0 moles of H2 in the reaction Fe2O3 + 3H2 → 2Fe + 3H2O?

Back

4 moles of Fe can be produced.

Front

What is the actual yield if the theoretical yield is 12.5 grams and the percent yield is 104%?

Back

The actual yield is 13.0 grams.