The Ka for HF is 7.2 x 10⁻4. What is ΔG at 25°C for a reaction mixture that is 1.5 x 10⁻3 M in F–, 4.5 x 10⁻2 M in HF with a pH of 2.75? The answer should be in kJ.

A) -10.5 kJ
B) 10.5 kJ
C) -5.2 kJ
D) 5.2 kJ