At 35^(@)C, the vapour pressure of CS_(2) is 512mmHg. And of acetone is 344mmHg. A solution of CS_(2) and acetone in, which the mole fraction of CS_(2) is 0.25, has a total pressure of 600mmHg. Which of the following statements is//are correct ?

At 35^(@)C, the vapour pressure of CS_(2) is 512mmHg. And of acetone i

1.	At 35^(@)C, the vapour pressure of CS_(2) is 512mmHg. And of acetone is 344mmHg. A solution of CS_(2) and acetone in, which the mole fraction of CS_(2) is 0.25, has a total pressure of 600mmHg. Which of the following statements is//are correct ?
Answer» A mixture of `100mL` of acetone and `100mL` of `CS_(2)` has a volume of `200ML` When acetone and `CS_(2)` are mixed at `35^(@)C`, heat must be absorbed in order to produce a solution at `35^(@)C` Process of mixing is exothermic Entropy of mixing is ZERO Solution :`X_(A)P_(A)^(@)+X_(B)P_(B)^(@)=0.25xx512+0.75xx344=386mm` Now `P_(A)+P_(B)=600 mm Hg`(Given) so `P_(A)+P_(B)gtX_(A)P_(A)^(@)+X_(B)P_(B)^(@)` THEREFORE, there is positive DEVITION from Raoult's law `DELTAHGT0` i.e., heat is absorbed.