Whis is the relationship between DG and DGf° for the reaction
MgF2(s) ===> Mg2+(aq) + 2 F-(aq)

Is it:
DG = {DGf°[Mg2+(aq)] + 2 DGf°[F-(aq)] - DGf°[MgF2(s)]} + RT ln([Mg2+][F-]2)


DG = {DGf°[Mg2+(aq)] + 2 DGf°[F-(aq)] + RT ln([Mg2+][F-]2)

or am I completely wrong?

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