Mass to Mass Stoichiometry

Substances in a chemical reaction react on a mole to mole basis or a molecule to molecule basis. There is no way to directly count molecules; however, molecules are counted indirectly by using the masses of substances. In order to relate the masses of reactants and products, the number of moles of each must be considered. In this topic, you will investigate mass to mass stoichiometry. This type of stoichiometry will allow you to indirectly count the moles in a reaction.

Essential Question

• What is the importance of a mole ratio in relating two substances in a chemical equation?