Question

From the following reduction potentials, determine the reduction potential of SN^4+ + 4e^- --> Sn^o

SN^2+ + 2e^- --> Sn^o | -0.135V
SN^4+ + 2e^- --> Sn^2+ | -0.15V

Answer 1

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Answer 2

I've always used a shortcut.
(n1*E1 + n2*E2)/(n1+n2)