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Question

Based on the following data, what is the standard Gibbs free energy of formation of the sulfate ion at 298K? (R= 8.31 J/(K·mol))
CaSO4(s) Ca2+(aq) + SO42-(aq); Ksp= 2.4 x10-5

SubstanceGºf(kJ/mol) at 298 K
Ca2+(aq)-553.5
CaSO4(s)-1322.0

A) -768.5 kJ/mol
B) -1849.2 kJ/mol
C) -1875.5 kJ/mol
D) -742.2 kJ/mol
E) 794.8 kJ/mol

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