Conservation of Mass Problems Directions: Using this idea, solve the following problems. Record the mass of each substance below the chemical equation. You do not need to double or triple the masses to match the coefficient. That mass is included in the question. Include units in your answer.

1. If 500 g of KClO₃ decomposes and produces 303 g of KCl, how many grams of O₂ are produced?
2KClO₃ → 2KCl+3O₂

2. How many grams of H₂ are needed to react with 100 g of N₂ to produce 121 g of NH₃?
N₂+3H₂ → 2NH₃

3. How many grams of oxygen are needed to react with 350 g of iron to produce 500 g of Fe₂O₃?
4Fe+3O₂→ 2Fe₂O₃

4. 16 g of CH4 reacts with 64 g of O₂ producing 44 g of CO₂. How many grams of water are produced?
CH4+2O₂ → CO₂+2H₂O

5. How much CO₂ is produced from the decomposition of 200 g of CaCO₃ if 112 g of CaO are produced?
CaCO₃ → CaO + CO₂