Chapter 18, Problem 18.12QP

Interpretation Introduction

Interpretation: The addition of sidewalk deicer ${\text{CaCl}}_{\text{2}}$(calcium chloride) to water is given to cause the temperature of the water to increase. Solid ${\text{CaCl}}_{\text{2}}$ being considered the system, the sign of $\Delta S_{\text{sys}}$ and $\Delta S_{\text{surr}}$ is to be stated.

Concept introduction: Entropy is a thermodynamic property which shows the randomness or disorder of the atoms within the system.

$\Delta S_{\text{sys}}$ is known as the entropy change for a system and $\Delta S_{\text{surr}}$ is known as entropy change for a surrounding.

To determine: The sign of $\Delta S_{\text{sys}}$ and $\Delta S_{\text{surr}}$, when solid ${\text{CaCl}}_{\text{2}}$(calcium chloride) is added to the water.