Chapter 16.1, Problem 11SSC

Interpretation Introduction

Interpretation:

The relation between the speed of a chemical reaction and the spontaneity of the reaction needs to be explained.

Concept introduction:

Spontaneity of a chemical reaction is related to change in free energy $\left(\Delta G\right)$. If $\Delta G$ is negative, the reaction is spontaneous under the conditions specified. If $\Delta G$ is positive, the reaction is not spontaneous.

Answer to Problem 11SSC

Spontaneity has no relation with the speed of reaction.

Explanation of Solution

Rate of reaction is not related to spontaneity of a reaction. If a reaction has negative $\Delta G$ value, it does not indicates that reaction is fast or slow also the magnitude of $\Delta G$ does not affect rate. $\Delta G$ indicates only the natural tendency for a reaction or process to proceed.

Conclusion

The sign of $\Delta G$ indicates the reaction is spontaneous or not.