Chapter 15.5, Problem 45PP

Interpretation Introduction

Interpretation:

The sign of $\Delta S_{system}$ for the given change is to be predicted.

Concept introduction:

$\Delta S_{system}$ denotes the entropy change occurring in the reaction.

Entropy of the system is the degree of randomness in the system.

More the disorder more is the value of entropy.

Answer to Problem 45PP

The sign of $\Delta S_{system}$ can’t be predicted.

Explanation of Solution

In the reaction,

$Fe(s)+Z{n}^{2+}(aq)\to F{e}^{2+}(aq)+Zn(s)$

The state of reactants and products is similar. So, sign of the entropy change can’t be predicted by the reaction alone.

Conclusion

Thus, reaction in which there is no change in states of species, sign of entropy change can’t be predicted.