Question

if the mass of the products measured 120 g, what would be the mass of the reactants?
30 g
60 g
120 g
240 g

Explanation:

Step1: Recall the Law of Conservation of Mass

The Law of Conservation of Mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products.

Step2: Apply the Law to the Problem

Given the mass of products is 120 g. By the Law of Conservation of Mass, the mass of reactants should be equal to the mass of products. So the mass of reactants is 120 g.

Answer:

120 g (corresponding to the option "120 g")