Question

If the mass of the products measured 120g what would the mass of the reactants
A. 30g
B. 60g
C. 120g
D. 240g

Answer 1

It has to be 120g because each and every chemical equation has to satisfy the law of conservation of mass, ie sum of mass of products is always equal to the sum of masses of reactants. If reactants=120g, then products=120g