Q.

At 363K, the vapour pressure of A is 21 kPa and that of B is 18kPa. One mole of A and 2 moles of B are mixed. Assuming that this solution is ideal, the vapour pressure of the mixture is ____________ kPa. (Round off to the Nearest integer).

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answer is 19.

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Detailed Solution

PT=PA0XA+PB0XB=21×13+18×23 =19 kPa
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At 363K, the vapour pressure of A is 21 kPa and that of B is 18kPa. One mole of A and 2 moles of B are mixed. Assuming that this solution is ideal, the vapour pressure of the mixture is ____________ kPa. (Round off to the Nearest integer).