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Raoult's Law

Acetone chl...

Question

Acetone & chloroform form a non ideal solution. If 116 gm of acetone is mixed with 239 gm of chloroform & their vapour pressures in pure state at 298 K are 360 torr &300 torr respectively then what would be vapour pressure of the above solution at 298 K.

330 torr

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350 torr

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250 torr

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370 torr

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Solution

The correct option is A 330 torr
$C H_{3} C O C H_{3} + C H C l_{3} (- v e d e v i a t i o n)$
$\frac{116}{58} = 2 m o l \frac{239}{119.5} = 2 m o l$
$p^{\circ} = 360 p^{\circ} = 300$
$P_{s o l u t i o n} = 0.5 \times 360 + 0.5 \times 300 = 330 (i d e a l)$
$P_{s o l u t i o n} (e x p .) < P_{s o l u t i o n} (i d e a l)$

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