Question

The signs of $△$ H, $△$ S and $△$ G for a non-spontaneous reaction at all temperatures would be:

• A. +, +, -
• B. +, -, +
• C. -, -, -
• D. +, +, +

Answer 1

The correct option is B +, -, +

$\Delta H<0,\Delta S>0\to$ Spontaneous at any temperature.

$\Delta H>0,\Delta S<0\to$ Non-spontaneous regardless of the temperature.

$\Delta H>0,\Delta S>0\to$ Spontaneous at certain temperature range.

$\Delta H<0,\Delta S<0\to$ Spontaneous at certain temperature range.

$\Delta G<0\to$ In order for reaction to be Spontaneous at given temperature.

$\Delta G>0\to$ In order for reaction to be Non-Spontaneous at given temperature.