Question

If the enthalpy change for the following reaction at $300\,\text{K}$ is $+7\,\text{kJ mol}^{-1}$, find the entropy change of the surroundings.
$H_2O_{(s)} \longrightarrow H_2O_{(l)}$

• A. $-42.8~J~K^{-1}$
• B. $-23.3~J~K^{-1}$
• C. $-30.7~J~K^{-1}$
• D. $-110.0~J~K^{-1}$

Hint:

Thermodynamics Tip: Always remember the negative sign! An endothermic process ($\Delta H>0$) absorbs heat from the surroundings, thereby decreasing the entropy of the surroundings ($\Delta S_{surr}<0$).

Answer 1

The Correct Option is B