Ksp of PbCl2(s) = 1.7x10-5
Delta Gf of PbCl2 = -314KJ/mol
Delta Gf of Pb2+ = -24.3KJ/mol
Calculate the standard free energy change for the formation of Cl-
The reaction that occurs is:
PbCl2 = Pb + 2 + 2 Cl-
The ΔG of the reaction is calculated:
ΔG = - R * T * ln K = - 0.008314 * 298 K * ln 1.7x10 ^ -5 = 27.21 kJ / mol
It has:
ΔG = ΔG products - ΔG reagents
27.21 = -24.3 + 2 * ΔG Cl- - (-314)
ΔG Cl- = - 131.2 kJ / mol is cleared
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