The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27°C is
42.3 J mol–1 K–1
38.3 J mol–1 K–1
35.8 J mol–1 K–1
32.3 J mol–1 K–1
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The Gibbs energy for the decomposition of Al2O3 at 500°C is as follows:$\dfrac{2}{3}$Al2O3 → $\dfrac{4}{3}$Al + O2, ΔrG = +966 kJ mol–1
The potential difference needed for electrolytic reduction of Al2O3 at 500°C is at least