Question

A process is spontaneous at a given temperature if

• A. $\Delta H = 0,\Delta S < 0$
• B. $\Delta H > 0,\Delta S < 0$
• C. $\Delta H < 0,\Delta S > 0$
• D. $\Delta H > 0,\Delta S = 0$

Answer 1

Answer: (C)

$\Delta H < 0,\Delta S > 0$

Answer 2

$\Delta G = \Delta H - T \Delta S$ A process is spontaneous if $\Delta G$ is -ve and $\Delta G$ will be -ve when $\Delta H$ is -ve and $\Delta S$ is positive.