In your own words Describe the Law of Conservation of Mass and what it has to do with balancing chemical equations. USE YOUR OWN WORDS

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Explanation:

The law of conservation of mass states that mass cannot be created nor destroyed.

Explanation:

In terms of chemical equations, in a basic reaction, the amount of mass produced in the products must be the same as the amount of mass of the inital reactions. Therefore, we must balance chemical equations in order to fulfill law of conservation of mass. For example, if H2 + O2 -> H2O, you must add a 2 coefficient to balance the equation in order for the equation to obey the law of conservation of mass. Therefore, it must be 2H2 + O2 -> 2H2O. 4 hydrogens and 2 oxygens go in, and 2 water molecules come out (4 hydrogens, 2 oxygens).

im not exactly sure but i think its b!

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)