1. Law of Conservation of Mass

2. Review/ Instructions
Mass is neither created nor destroyed during a chemical reaction- it is conserved
Mass reactants = Mass products
Use your knowledge of the Conservation of mass to answer the following questions.

3. Problems
1) 2 Cu + O2  2CuO
When 127 g of copper reacts with 32 g of oxygen gas to form copper (II) oxide, no copper or oxygen is left over. How much copper (II) oxide is produced?
Ca ZnCO3  CaCO3 + Zn
64 g g g ?
According to the law of conservation of mass, how much zinc was present in the zinc carbonate?
CaCO3  CaO CO2
100g g ?
According to the law of conservation of mass, how much carbon dioxide was produced?