`1. the products in a reactions will always have... (a) the same total mass as the reactants

(b)the same number of molecules as the reactants

(c) less mass than the reactants

(d) a greater number of molecules than the reactants

a

Explanation:

as the law of conservation of matter (mass) states: matter can not be created nor destroyed but can transform from a form to another.

since the conversion of mass to energy can not be done except in nuclear reactions via (E= mc2). normal chemical equations must be balanced to achieve the law.

the correct answer is:

a. formation of precipitation