Question

A reaction occurs spontaneously if:

• A. T$\triangle$S < $\triangle$H and both $\triangle$H and $\triangle$S are +ve
• B. T$\triangle$S > $\triangle$H and both $\triangle$H and $\triangle$S are +ve
• C. T$\triangle$S = $\triangle$H and both $\triangle$H and $\triangle$S are +ve
• D. T$\triangle$S >$\triangle$H and $\triangle$H is +ve and $\triangle$S is -ve

Answer 1

Answer: (B)

T$\triangle$S > $\triangle$H and both $\triangle$H and $\triangle$S are +ve

Answer 2

The negative value of G serves as the foundation for response spontaneity.
According to the following equation (Gibbs-Helmholtz equation), G is based upon T, S, and H.
$\triangle$G = $\triangle$H−T$\triangle$S
The reaction is spontaneous if the magnitude of HTS is negative.
G is negative when TS > H, and when both H and S are positive.

Therefore, the correct option is (B): T$\triangle$S > $\triangle$H and both $\triangle$H and $\triangle$S are +ve