In the acid-base reaction below, determine the ∆G° in kcal/mol at 279 K.

• A. ∆G° = +1.09 kcal/mol
• B. ∆G° = −1.92 kcal/mol
• C. ∆G° = +1.91 kcal/mol
• D. ∆G° = −1.09 kcal/mol

Answer: (C)