SolutionHard
Question
At 35oC, the vapour pressure of CS2 is 512 mmHg, and of acetone is 344 mmHg. A solution of CS2 and acetone in, which the mole fraction of CS2 is 0.25, has a total vapour pressure of 600mmHg. Which of the following statements is/are correct ?
Options
A.A mixture of 100 mL of acetone and 100 mL of CS2 has a volume of 200 mL
B.When acetone and CS2 are mixed at 35oC, heat must be absorbed in order to produce a solution at 35oC
C.Process of mixing is exothermic
D.Entropy of mixing is zero
Solution
XAPA0 + XBPB0 = 0.25 × 512 + 0.75 × 344 = 386 mm
Now PA + PB = 600 mm Hg (Given)
so PA + PB > XAPA0 + XBPB0
therefore, there is positive devition from Raoult′s law
ᐃH > 0 i.e., heat is absorbed.
Now PA + PB = 600 mm Hg (Given)
so PA + PB > XAPA0 + XBPB0
therefore, there is positive devition from Raoult′s law
ᐃH > 0 i.e., heat is absorbed.
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