For the reaction c2h6 (g) → c2h4 (g) + h2 (g) δh° is +137 kj/mol and δs° is +120 j/k ∙ mol. this reaction is question 10 options: spontaneous only at high temperature spontaneous at all temperatures spontaneous only at low temperature nonspontaneous at all temperatures

spontaneous only at high temperature

Explanation:

The Gibbs free energy change is given by:

= Gibbs free energy

when = +ve, reaction is non spontaneous

= -ve, reaction is spontaneous

= 0, reaction is in equilibrium

= enthalpy change = endothermic = +137 KJ

= entropy change = +120 J/K

Now when has more value than

Thus reaction is spontaneous at high temperatures.