The Gibb-s energy for the decomposition of Al2O3 at 500oC is as follows- 2 3 Al 2 O 3 - 4 3Al- O 2 - - G-960 kJ-The potential difference needed for the electrolytic reduction of aluminium oxide Al2O3 at 500oC is at least-

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Gibbs Free Energy & Spontaneity

The Gibb's en...

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The Gibb's energy for the decomposition of ${A l}_{2} O_{3}$ at $500^{o} C$ is as follows:

$\frac{2}{3} {A l}_{2} O_{3} ⟶ \frac{4}{3} A l + O_{2};$ $Δ G = + 960 k J$ .

The potential difference needed for the electrolytic reduction of aluminium oxide ( ${A l}_{2} O_{3}$ ) at $500^{o} C$ is at least:

4.5 V

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3.0 V

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2.5 V

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{A l}_{2} O_{3}

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\frac{2}{3} {A l}_{2} O_{3} \to \frac{4}{3} A l + O_{2}; Δ_{r} G = + 960 k J {m o l}^{- 1}

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{A l}_{2} O_{3}

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\frac{2}{3} {A l}_{2} O_{3} \to \frac{4}{3} A l + O_{2}; Δ_{r} G = + 96 k J

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\frac{2}{3} A l_{2} O_{3} \to \frac{4}{3} A l + O_{2}, Δ_{r} G = + 966 k J m {o l}^{- 1}

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\frac{2}{3} {A I}_{2} O_{3} ⟶ \frac{4}{3} A I + O_{2}; △_{r} G = + 966 k J {m o l}^{- 1}

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\frac{2}{3} A l_{2} O_{3} \to \frac{4}{3} A l + O_{2}

Δ_{r x n} G = + 960 k J m o l^{- 1}

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