The vapour pressure of two volatile liquid mixtures is (in cm of Hg)

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Problem

The vapour pressure of two volatile liquid mixtures is

P_T = 5.3 + 2X_B

(in cm of Hg), where

X_B

is mole fraction of

B

is mixture. What is the ratio of

X_A

and

X_B

in vapour phase? (1)

\frac{73}{53}

(2)

\frac{73}{53} \times \frac{P_A'}{P_B'}

(3)

\frac{53}{73}

(4)

\frac{53}{73} \times \frac{P_B'}{P_A'}