Question

20 multiple choice 2 points which of the following statements correctly describes the contribution of δs° to δg°? the entropy term always makes a more significant contribution to δg° than does the enthalpy term. the entropy term makes a greater contribution to δg° in exothermic reactions. the entropy term makes a greater contribution to δg° at high temperatures. the entropy term makes a greater contribution to δg° at low temperatures. the entropy term makes a greater contribution to δg° in endothermic reactions.

Explanation:

Step1: Recall Gibbs - free energy equation

The Gibbs - free energy change is given by $\Delta G^{\circ}=\Delta H^{\circ}-T\Delta S^{\circ}$, where $\Delta H^{\circ}$ is the enthalpy change, $T$ is the temperature in Kelvin, and $\Delta S^{\circ}$ is the entropy change.

Step2: Analyze the effect of temperature on $\Delta S^{\circ}$ contribution

As $T$ increases, the magnitude of the $T\Delta S^{\circ}$ term increases. So, the entropy - term $T\Delta S^{\circ}$ has a greater impact on $\Delta G^{\circ}$ at high temperatures compared to low temperatures. The significance of the entropy term relative to the enthalpy term is not determined by whether the reaction is exothermic or endothermic, and it does not always make a more significant contribution than the enthalpy term.

Answer:

The entropy term makes a greater contribution to $\Delta G^{\circ}$ at high temperatures.