Question

For a reaction to be spontaneous with a positive enthalpy and a positive entropy value, the temperature should be :

• A. low
• B. high
• C. this combination will always be spontaneous
• D. All temperatures
• E. this combination will always be non spontaneous

Answer 1

Answer: (B)

high

$\Delta G=\Delta H-T\Delta S$,
For $\Delta H$ to be positive and positive entropy ($\Delta S$) , the product of the T and $\Delta S$ must have the higher negative value than the $\Delta H$ numerical positive value.
Hence, T must be high.