Based on the following data, what is the standard Gibbs free energy of formation of the sulfate ion at 298 K? ( R = 8.31 J/(K ∙ mol)) PbSO4(s) Pb2+(aq) + SO42–(aq); Ksp = 1.7 × 10–8

Substance ΔG°f (kJ/mol) at 298 K
Pb2+(aq)
–24.4

PbSO4(s)
–813.0
a. –788.6 kJ/mol

b. –793.1 kJ/mol

c. –837.4 kJ/mol

d. –744.3 kJ/mol

e. 832.9 kJ/mol