Question: The phase diagram for SO2 is shown here. (a) What does this diagram tell you about the enthalpy change in the reaction SO2(I) SO2(g)? (b)

The phase diagram for SO2 is shown here.
(a) What does this diagram tell you about the enthalpy change in the reaction SO2(I) †’ SO2(g)?
(b) Calculate the equilibrium constant for this reaction at 100 oC and at 0 oC.
(c) Why is it not possible to calculate an equilibrium constant between the gas and liquid phases in the supercritical region?
(d) At which of the three points marked in red does SO2(g) most closely approach ideal-gas behavior?
(e) At which of the three red points does SO2(g) behave least ideally?

Supercritical region 2 10 Liquid Critical point 10 1 Gas 10-1 0 100 200 300 Temperature C

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