-The reaction represented in the above drawing is likely to be
A)nonspontaneous at all temperatures.
B)nonspontaneous at low temperatures and spontaneous at high temperatures.
C)spontaneous at low temperatures and non spontaneous at high temperatures.
D)spontaneous at all temperatures.

Question

-The reaction represented in the above drawing is likely to be
A)nonspontaneous at all temperatures. 
B)nonspontaneous at low temperatures and spontaneous at high temperatures. 
C)spontaneous at low temperatures and non spontaneous at high temperatures. 
D)spontaneous at all temperatures.

Quizplus · Accepted Answer

The reaction's spontaneity depends on the sign of the Gibbs free energy change (ΔG), which is influenced by the enthalpy change (ΔH) and the entropy change (ΔS) according to the equation ΔG = ΔH - TΔS. If a reaction is nonspontaneous at low temperatures but becomes spontaneous at high temperatures, it suggests that ΔH is positive (endothermic reaction) and ΔS is positive (increase in disorder). At low temperatures, the TΔS term is too small to overcome the positive ΔH, making the reaction nonspontaneous. However, at high temperatures, the TΔS term becomes significant enough to make ΔG negative, thus making the reaction spontaneous.

-The Reaction Represented in the Above Drawing Is Likely to Be