A reaction,A + B rightarrow C + D + q,is foun | vedclass

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(D) For a reaction to be spontaneous,the Gibbs free energy change $\Delta G$ must be negative.The relationship is given by $\Delta G = \Delta H - T\De

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possible at any temperature

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(D) For a reaction to be spontaneous,the Gibbs free energy change $\Delta G$ must be negative.The relationship is given by $\Delta G = \Delta H - T\Delta S$.According to the reaction $A + B \rightarrow C + D + q$,the term $q$ indicates that heat is evolved,so the enthalpy change $\Delta H$ is negative.Given that the entropy change $\Delta S$ is positive,the term $-T\Delta S$ will always be negative for any temperature $T > 0$.Since both $\Delta H$ and $-T\Delta S$ are negative,$\Delta G$ will be negative at all temperatures.Therefore,the reaction is spontaneous at any temperature.

$A$ reaction,$A + B \rightarrow C + D + q$,is found to have a positive entropy change. The reaction will be:

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