SOLUTION:
Assume that the temperature is 298 K.
[tex]\begin{aligned} \Delta G & = \Delta H - T\Delta S \\ & = \text{25.7 kJ} - (\text{298 K})(\text{0.1083 kJ/K}) \\ & = \text{25.7 kJ} - \text{32.3 kJ} \\ & = \boxed{-\text{6.6 kJ}} \end{aligned}[/tex]
Hence, the answer is a. -6.6 kJ.
[tex]\\[/tex]
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