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Question
Given the following two half-reactions, write the overall balanced reaction in the direction in which it is spontaneous and calculate the standard cell potential.
Ga3+(aq) + 3 e- Ga(s) E = -0.53 V
Sn4+(aq) + 2 e- Sn2+(aq) E = +0.15 V
A.2 Ga3+(aq) + 3 Sn2+(aq) 2 Ga(s) + 3 Sn4+(aq) 
= +0.68 V
B.3 Ga3+(aq) + 2 Sn2+(aq) 3 Ga(s) + 2 Sn4+(aq) = -1.89 V
C.2 Ga(s) + 3 Sn4+(aq) 2 Ga3+(aq) + 3 Sn2+(aq) = +0.68 V
D.3 Ga(s) + 2 Sn4+(aq) 3 Ga3+(aq) + 2 Sn2+(aq) = +0.38 V
E.2 Ga(s) + 3 Sn4+(aq) 2 Ga3+(aq) + 3 Sn2+(aq) = +1.89 V
Answer
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