Question

For reaction both enthalpy change and entropy change are positive.under what conditions the reaction will be spontaneous

Answer 1

If ΔH(enthalpy) iss negative and
ΔS is negative then ΔG will be negative at low temperatures

If change in Gibbs energy is -ve then reaction will be spontaneous..

Answer 2

Answer: At high temperatures

Explanation: $\Delta G=\Delta H-T\Delta S$

$\Delta G$ = Gibb's free energy change

$\Delta H$= enthalpy change

T = temperature

$\Delta S$ = entropy change

A reaction is spontaneous when $\Delta G$ = Gibb's free energy change is negative.

Thus $\Delta G=(+\Delta H)-T(+\Delta S)$

$\Delta G=+(\Delta H)-T(\Delta S)$

Thus the reaction is spontaneous or $\Delta G$ is negative only when $T(\Delta S)>\Delta H$

That means the temperature must be high.