The correct option for the value of vapour pressure of a solution at 45° C with benzene to octane in molar ratio 3 : 2 is [At 45° C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume ideal gas.] [2021]

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Solution

Q.
The correct option for the value of vapour pressure of a solution at 45° C with benzene to octane in molar ratio 3 : 2 is

[At 45° C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume ideal gas.] [2021]

1 350 mm of Hg

2 160 mm of Hg

3 168 mm of Hg

4 336 mm of Hg

Ans.
(4)

$P_{total} = p_{benzene} x_{benzene} + p_{octane} x_{octane}$

$= 280 \times \frac{3}{5} + 420 \times \frac{2}{5} = 168 + 168$

$= 336$ $mm$ $of$ $Hg$

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