According to the Law of Conservation of Mass, how many grams of product will be produced when 4 grams of reactants are involved in a chemical reaction?

A. 2

B. 3

C. 4

D. 8

The answer is four. The law of conservation of mass basically says that whatever is but in will always have the same mass coming out. so for example if you had 10 grams of water and then you heated it up, it is still 10 grams of water.