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The value of P⁰for benzene is 640 mm of Hg. The vapour pressure of solution containing 2.5 gm substances in 39gm benzene is 600mm of Hg the molecular mass of X is

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65.25

130

answer is D.

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Detailed Solution

$\frac{P^{0} - P}{P^{0}} = \frac{n_{2}}{n_{1} + n_{2}} \Rightarrow \frac{640 - 600}{640} = \frac{2.5 / m}{39 / 78}$

$m = \frac{640 X 78 X 2.5}{39 X 40} = 80$

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