Stoichiometry - Mass to Mass

This conversion is almost exactly the same as the other conversions, except that we add an additional step. We go from Mass -> Moles -> Mole Ratio -> Mass. REMEMBER 2 RULES: 1. Balanced equation and 2. What you need over what you have.

Examples:

1. How many grams of Oxygen are produced from the decomposition of 3.0g of Potassium chlorate?
2. Solid Zinc reacts with Hydrochloric Acid. What mass of Hydrogen is produced when 2.5g of Zinc react?