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At a constant temperature liquid 'A' has...

At a constant temperature liquid `'A'` has vapour pressure of `170 mm Hg` and liquid `'B'` has vapour pressure of `280 mm Hg`. A solution of the two at the same temperature in which mole fraction of `A` is `0.7` has a total vapour pressure of `376 mm`. Identify whether the solution process is Endothermic or Exothermic ?

Text Solution

Verified by Experts

The correct Answer is:
Endothermic
`P_(T)=0.7xx170+0.3xx280`
(Theo.)
`=203 mm Hg`
But `P_(T)=376mm Hg`
(obsed)
`because P_(T_("obsed"))gtP_(T_("Theo"))`
`therefore` solution shows `(+) ve` deviation which means `DeltaH_("mix")gt0`
or solution is endothermic.
`therefore` Heat will be absorbed in the formation of solution.
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Knowledge Check

  • At 35^(@) C the vapour pressure of CS_(2) is 512 mm Hg and of asetone is 344 mm Hg.A solution of Cs_(2) and acetone in which the mole fraction of CS_(2) is 0.25, has a total vapour pressure of600 mmHg .which of the following Statement is /are correct?

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    C
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  • The vapour pressure of benzene at 25^@C is 63.7 mm of Hg and the vapour pressure of a solution of a solute in C_6H_6 at the same temperature is 63.9 mm of Hg. The molality of solution is

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