• In order to find the number of moles of a product that is produced in a chemical reaction when you are given moles of reactant, simply multiply the moles of reactant by the stoichiometric ratio relating that reactant and the desired product; i.e., $(molreactant)\times \left ( \frac{molproduct}{molreactant} \right )$
• In order to find the number of moles of a product that are produced in a chemical reaction when you are given mass of reactant, simply divide the mass of reactant by the molar mass (to get moles reactant) and then multiply by the stoichiometric ratio relating that reactant and the desired product; i.e., $\left ( \frac{grams}{grams/mol} \right )\times \left ( \frac{molproduct}{molreactant} \right )$
• Always remember, mass divided by molar mass equals moles; $\left ( \frac{grams}{grams/mol} \right )=mol$