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Like iron, nickel will also form a complex ion with thiocyanate at 25 °C, according to...

Like iron, nickel will also form a complex ion with thiocyanate at 25 °C, according to the reaction: Ni2+(aq) + 3 SCN- (aq) ←→ [Ni(SCN)3] - (aq)
K = 65
a) (3 marks) Calculate ΔrxnG° for this reaction.

I've figured part a out, i got an answer of -10.34kJ/mol, i just need help with part b
b) (3 marks) Calculate ΔrxnG for this reaction when [Ni2+] = 0.010 mol/L, [SCN- ] = 0.020 mol/L, and [Ni(SCN)3 - ] = 0.060 mol/L.

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