Question

# Which of the following expression is used to calculate the standard entropy change for the reaction:

A
ΔrS0=[2S0Fe+S0Al2O3][2S0Al+S0Fe2O3]
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B
ΔrS0=S0Al2O3S0Fe2O3
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C
ΔrS0=[2S0Fe+S0Fe2O3]S0Fe2O3
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D
ΔrS0=[S0Fe+12S0Fe2O3][S0Al+S0Fe2O3]
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Solution

## The correct option is A ΔrS0=[2S0Fe+S0Al2O3]−[2S0Al+S0Fe2O3]The balanced chemical reaction is: 2Al(s)+Fe2O3(s)→2Fe(s)+Al2O3(s) ΔH∘=−851.4kJThe expression is used to calculate the standard entropy change for the reaction is: ΔrS0=[2S0Fe+S0Al2O3]−[2S0Al+S0Fe2O3]The standard entropy change for the reaction is the difference in the total standard entropy of products and the total standard entropy of reactants.Hence, the correct option is A

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