dessicantsdrying agents can often be regenerated, Chemistry

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dessicantsdrying agents can often be regenerated

Dessicants(drying agents) can often be regenerated by heating. A dessicant that is commonly regenerated is CaSO₄.2H₂O:

CaSO₄.2H₂O(s) → CaSO₄(s) + 2H₂O(g)

H^o = 25.1 kJ/mol; ?S^o = 69.3 J/molK

Regeneration is carried out at 250 ^oC.

(a) What is the ?G^o for this reaction?

(b) What is the equilibrium constant at 25 ^oC?

(d) What is the equilibrium constant at 250 ^oC

(e) Is regeneration of this dessicant an enthalpy- or entropy-driven process? Explain your answer.

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