# What is the Law of Conservation of Mass?

Jul 2, 2016

Simply that mass is conserved in every chemical reaction.

#### Explanation:

Given the conservation of mass, if I start with $10 \cdot g$ of reactants from all sources, at most I can get $10 \cdot g$ of products. In practice, I am not even going to get that, because losses occur on handling and purification. Every chemical reaction that has ever been observed obeys this law.