Stoichiometry

What is stoichiometry?

The calculation of the quantities of reactants and products in a chemical reaction, based on mole ratios from a balanced equation

What must be true of a chemical equation before you can do stoichiometry calculations with it?

It must be balanced — the coefficients give the mole ratios between substances

In the reaction 2H2 + O2 → 2H2O, how many grams of H2O are produced from 4.04 g of H2? (H2 and H2O are in a 1:1 mole ratio in this equation)

36.04 g

In the reaction 2Mg + O2 → 2MgO, how many grams of MgO are produced from 48.62 g of Mg? (Mg and MgO are in a 1:1 mole ratio in this equation)

80.62 g

In the reaction CaCO3 → CaO + CO2, how many grams of CaO are produced from 100.09 g of CaCO3? (CaCO3 and CaO are in a 1:1 mole ratio in this equation)

56.08 g