Chapter 18, Problem 18.39QP

Interpretation Introduction

Interpretation: The signs of $\Delta S$, $\Delta H$ and $\Delta G$ for the sublimation of dry ice $\left(\text{solid}{\text{CO}}_{\text{2}}\right)$ at $25°\text{C}$ are to be predicted.

Concept introduction: The value of $\Delta H$ is negative when energy is released. The value of $\Delta H$ is positive when energy is absorbed.

The value of $\Delta G$ is negative for feasible or spontaneous process. The value of $\Delta G$ is positive for not feasible or non-spontaneous process.

The value of $\Delta S$ is negative when entropy is decreased. The value of $\Delta S$ is positive when entropy is increased.

To determine: The signs of $\Delta S$, $\Delta H$ and $\Delta G$ for the sublimation of dry ice $\left(\text{solid}{\text{CO}}_{\text{2}}\right)$ at $25°\text{C}$.