For compound Z

CHEMISTRY · Multi-part · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

For compound Z,

\Delta H^\circ = +20\,\text{kJ}\cdot\text{mol}^{-1}

and

\Delta S^\circ = +60\,\text{J}\cdot\text{mol}^{-1}\cdot\text{K}^{-1}

. (1) Calculate

\Delta G^\circ

(kJ mol⁻¹) for the dissolution of Z at 273 K. (2) Calculate

\Delta G^\circ

(kJ mol⁻¹) for the dissolution of Z at 373 K. (3) Explain how the difference in

\Delta G^\circ

values between 273 K and 373 K predicts the trend in the solubility of Z as temperature increases.