Chapter 19, Problem 42R

To determine

To explain: The best description of the equilibrium state of a chemical reaction.

Answer to Problem 42R

The right answer is option A − they form at equal rates.

Explanation of Solution

Introduction:

The equilibrium state of a chemical reaction is that state where the rate of forward reaction becomes equal to the rate of reverse reaction.

When a reaction is at equilibrium, the concentration of reactant and product can be same or different. There is no specific explanation on which concentration is more that is reactant or product. The concentration of reactant can be more than product, or it can even be less than product. Thus, option (b) and (c) are incorrect. Since, it is not compulsory that there is equal amount of reactant and product thus, option (d) is incorrect.

At equilibrium, the change in concentration of reactant is equal to that of product thus, they form at equal rates.

Conclusion:

Thus, the right answer is option A − they form at equal rates.