At 35°C, the vapour pressure of CS₂ is 512 mm Hg and that of acetone (CH₃COCH₃) is 344 mm Hg. A solution of CS₂ and acetone, in which the mole fraction of CS₂ is 0.25 has a total vapour pressure of 60

Question

At 35°C, the vapour pressure of CS₂ is 512 mm Hg and that of acetone (CH₃COCH₃) is 344 mm Hg. A solution of CS₂ and acetone, in which the mole fraction of CS₂ is 0.25 has a total vapour pressure of 600 mm Hg. Which of the following statements about this solution is true?

Prashant Kotian · Accepted Answer

Correct answer: C. Ideal P = 512 × 0.25 + 344 × 0.75 = 386 mm Hg. Observed P (600 mm) >> ideal → large positive deviation → ΔH_mix > 0 → heat is absorbed on mixing.

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