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# In a mixture of A and B if the mole fraction of the component A in vapour phase is $X_1$ and mole fraction of component A in liquid mixture is $X_2 (P^0_A$ = vapour pressure of pure A;$P^0_B$ = vapour pressure of pure B), then total vapour pressure of the liquid mixture is :

$\large\frac{P^0_AX_2}{X_1}$