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प्रश्न
What is the standard free energy change for the following reaction at room temperature? Is the reaction spontaneous?
\[\ce{Sn(s) + 2Cu^{2+}(aq) -> Sn^{2+}(aq) + 2Cu+(s)}\]
उत्तर
F = 96500 C, n = 2
\[\ce{Sn^{2+}(aq) + 2e^{–} -> Sn(s) -0.14V}\]
\[\ce{Cu^{2+}(aq) + e^{-} -> Cu^{+}(aq) 0.15 V}\]
Eocell = Eocathode – Eoanode
= 0.15 – (– 0.14)
= 0.29 V
ΔGo = – nFEocell
= –2 × 96500 × 0.29
= – 55970 J/mol
Since ΔG° is negative, the reaction is spontaneous under standard conditions.
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