Chapter 12, Problem 84A

Interpretation Introduction

Interpretation : Mass and atoms are conserved in every chemical reaction, but moles are not necessarily conserved to be explained.

Concept Introduction : A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. Reactants are substances that interact to make new substances, whereas products are those substances that result from the interaction.

Answer to Problem 84A

The structure of the molecules differs due to which the moles are not conserved in a chemical reaction.

Explanation of Solution

For a low-energy thermodynamic process, the reactant and product masses must match up in accordance with the law of conservation of mass.

In every chemical reaction, the mass and atoms are conserved.

The chemical reaction should be balanced where it differs in the number of moles of reactants and products.

The number of moles is not conserved in chemical reactions due to the balancing of reactions and variation in products and reactants.