A reaction has Delta H=+42.6 kJ mol^-1 and Delta S=+120 J mol^-1K^-1, both assumed independent of temperature. The reaction is spontaneous

JEE Main levelSingle correct optionDifficulty 2 of 3td139

A reaction has $Δ H = + 42.6 kJ mo l^{- 1}$ and $Δ S = + 120 J mo l^{- 1} K^{- 1}$ , both assumed independent of temperature. The reaction is spontaneous

Δ G = Δ H - T Δ S < 0

requires

T > Δ H /Δ S = 42600/120 = 355 K

. Since both

Δ H

and

Δ S

are positive, the entropy term wins only at high temperature.