3.

Question

In a chemical reaction, the total mass of the products _____.

must always be the same as the total mass of the reactants

can be greater or less than the total mass of the reactants

is always less than the total mass of the reactants in an open system

must be less than the total mass of the reactants

Answer 1

In a chemical reaction, the total mass of the products must always be the same as the total mass of the reactants.

This principle is known as the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction.