The vapour pressure of a liquid solution containing A and B is 99 torr. Calculate mole percentage of B in vapour phase ( given P A 0 = 100 torr ; P B 0 = 80 torr )

Question

The vapour pressure of a liquid solution containing A and B is 99 torr. Calculate mole percentage of B in vapour phase ( given P A 0 ​ = 100 torr ; P B 0 ​ = 80 torr )

TestHub · Accepted Answer

P = P A 0 ​ + x B ​ ( P B 0 ​ − P A 0 ​ ) 99 = 100 + x B ( − 20 ) ⇒ x B = 20 1 ​ Y B ​ = 99 80 × 20 1 ​ ​ = 99 4 ​ % mole B in vapour phase = 99 4 ​ × 100 = 4

Chemistry - Liquid Solution Question with Solution | TestHub

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