Wet limestone is used to scrub SO₂ gas from the exhaust gases of power plants. One possible reaction gives hydrated calcium sulfite:

Another reaction gives hydrated calcium sulfate:

(a) Which reaction is more product-favored at equilibrium? Use the data in the table below and any other information needed in Appendix L to calculate Δ_rG° for each reaction at 25°C.

(b) Calculate Δ_rG° for the reaction CaSO₃ ∙ 1⁄2 H₂O(s) + 1⁄2 O₂(g) ⇄ CaSO₄ ∙ 1⁄2 H₂O(s). Is this reaction product- or reactant-favored at equilibrium?

Data given in Appendix L

Transcribed Image Text:

CaCO3(s) + SO₂(g) + ¹/2 H₂O(l) CaSO, 1/2 H₂O(s) + CO₂(g)