已知25°C时, E (Fe 3+ ,Fe 2+ )=0.77V, E (Sn 4+ ,Sn 2+ )=0.15V。今有一电池,其电池反应为 2Fe 3+ ( a ) +Sn 2+ ( a ) = 2Fe 2+ ( a ) + Sn 4+ ( a ) , 则该电池的标准电动势 E MF (298.15K)为
A.
1.39V
B.
0.62V
C.
0.92V
D.
1.07V
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