Stoichiometry is based on the law of conservation of mass a. true b. false

I believe the above statement is true.
According to the law of conservation of mass, in a normal chemical equations, mass is neither created nor destroyed. Stoichiometry mainly deals with the chemical quantities of balanced chemical equations. The balancing of chemical equations ensures that the mass is maintained during a chemical reaction, such that the quantity of each element in the reaction is maintained. 

Um can u take a picture of the work