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Q.

At $10^{0} C,$ the vapour pressure of $A$ is $24 K P a$ and that of $B$ is $27 K P a .$ One mole of $A$ and 2 mole of $B$ are mixed. Assuming that this solution is ideal, the vapour pressure of the mixture of ______ $K P a$ (Round of the nearest integer)

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answer is 26.

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Detailed Solution

Using Raoult’s law $P = P_{A}^{0} X_{A} + P_{B}^{0} X_{B}$

$P = 24 \times \frac{1}{3} + 27 \times \frac{2}{3} = 26 K P a$

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