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Sulfur dioxide is a significant air pollutant, especially from coal-fired power-plants. The following reaction is the...

Sulfur dioxide is a significant air pollutant, especially from coal-fired power-plants. The following reaction is the basis of a suggested method for removal of SO2 from power-plant exhaust gases.   Is this reaction a feasible method of removing SO2? Why or why not? Support your answer using the provided thermodynamic data.

SO2(g)   +   2H2S(g) → 3S(s)   +   2H2O (g)

ΔG° = -90.5 kJ ΔH° = -146 kJ ΔS° = -186 J/K

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Answer #1

Since ΔG0 of the reaction is negative (-90.5 kJ/mol), the reaction is spontaneous. Hence it proceeds in forward direction. Therefore, the method is feasible for removal of SO2 from power-plant emission.

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