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Redox Reactions and Couple

Δ G∘f standar...

Question

$Δ G_{f}^{\circ}$ (standard free energy of formation) of $Z n O$ and $C O$ are $- 318.2$ kJmol $^{- 1}$ and $- 317.2$ kJmol $^{- 1}$ respectively.
Is reduction of $Z n O$ by carbon possible?
If yes enter 1. else enter 0.

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Solution

$Z n O + C \to Z n + C O$
$Δ^{\circ} = Δ G_{f}^{\circ} (C O) - Δ G_{f}^{\circ} (Z n O)$ $= - 137.3 - (- 318.2) = 180.9$ kJmol $^{- 1}$
Positive values of $Δ G^{\circ}$ indicates that reaction in non-spontaneous.

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