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in Chemistry by (52.5k points)

At 35°C, the vapour pressure of CS2 is 512 mm Hg and that of acetone is 344 mm Hg. A solution of CS2 in acetone has a total vapour pressure of 600 mm Hg. The false statement amongst the following is : 

(1) heat must be absorbed in order to produce the solution at 35°C 

(2) Raoult's law is not obeyed by this system 

(3) a mixture of 100 mL CS2 and 100 mL acetone has a volume < 200 mL 

(4) CS2 and acetone are less attracted to each other than to themselves

2 Answers

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by (54.8k points)
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Answer is (3) a mixture of 100 mL CS2 and 100 mL acetone has a volume < 200 mL

The vapour pressure of mixture ( = 600 mm Hg) is greater than the individual vapour pressure of its constituents (Vapour pressure of CS2 = 512 mm Hg, acetone = 344 mm Hg). Hence, the solution formed shows positive deviation from Raoult's law.

⇒ (1) Δsol. H > 0, (2) Raoult's law is not obeyed

(3) Δsol. Volume > 0

(4) CS2 and Acetone are less attracted to each ether than to themselves.

+1 vote
by (58.3k points)

Answer is (3)

P°CH3COCH3 = 344 

P°Cs2 = 512 

Ps = 600

This means solution will show +ve deviation Hence 

Vs > VA + VB

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