At 35oC the vapour pressure of CS2 is 512 mm Hg, and 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 solution of acetone - CS2 is true ?

Question

At 35oC the vapour pressure of CS2 is 512 mm Hg, and 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 solution of acetone - CS2 is true ? (A) A mixture of 100 ml of acetone and 100 ml of CS2 has a total 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) When acetone and CS2 are mixed at 35oC , heat is released. (D) Raoult's law is obeyed by both CS2 and acetone for the solution in which the mole fraction of CS2 is 0.25.

Tardigrade Admin · Accepted Answer

PT=PA° XA+PB° XB=512× 0.25+(344 × 0 .75)=386 ∴ The solution is showing positive deviation So For a solution of Acetone+CS2; ΔH=+ve

A mixture of 100 ml of acetone and 100 ml of $C S_{2}$ has a total volume of 200 ml.

When acetone and $C S_{2}$ are mixed at $3 5^{o} C$ , heat must be absorbed in order to produce a solution at $3 5^{o} C$ .

When acetone and $C S_{2}$ are mixed at $3 5^{o} C$ , heat is released.

Raoult's law is obeyed by both $C S_{2}$ and acetone for the solution in which the mole fraction of $C S_{2}$ is 0.25.

$P_{T} = P_{A}^{\circ} X_{A} + P_{B}^{\circ} X_{B} = 512 \times 0.25 + (344 \times 0.75) = 386$

∴ The solution is showing positive deviation

So For a solution of

$A ce t o n e + C S_{2}; Δ H = + v e$

A mixture of 100 ml of acetone and 100 ml of CS2​ has a total volume of 200 ml.

When acetone and CS2​ are mixed at 35oC , heat must be absorbed in order to produce a solution at 35oC .

When acetone and CS2​ are mixed at 35oC , heat is released.

Raoult's law is obeyed by both CS2​ and acetone for the solution in which the mole fraction of CS2​ is 0.25.

PT​=PA∘​XA​+PB∘​XB​=512×0.25+(344×0.75)=386 ∴ The solution is showing positive deviation So For a solution of Acetone+CS2​;ΔH=+ve

A mixture of 100 ml of acetone and 100 ml of $C S_{2}$ has a total volume of 200 ml.

When acetone and $C S_{2}$ are mixed at $3 5^{o} C$ , heat must be absorbed in order to produce a solution at $3 5^{o} C$ .

When acetone and $C S_{2}$ are mixed at $3 5^{o} C$ , heat is released.

Raoult's law is obeyed by both $C S_{2}$ and acetone for the solution in which the mole fraction of $C S_{2}$ is 0.25.

$P_{T} = P_{A}^{\circ} X_{A} + P_{B}^{\circ} X_{B} = 512 \times 0.25 + (344 \times 0.75) = 386$

∴ The solution is showing positive deviation

So For a solution of

$A ce t o n e + C S_{2}; Δ H = + v e$