Two liquids A and B form an ideal solution. At 320 K , the vapour pressure of the solution, containi

Question

Two liquids A and B form an ideal solution. At 320 K , the vapour pressure of the solution, containing 3 mol of $A$ and 1 mol of $B$ is 500 mm Hg . At the same temperature, if 1 mol of A is further added to this solution, vapour pressure of the solution increases by 20 mm Hg . Vapour pressure (in mm Hg ) of B in pure state is
$\_\_\_\_$ . (Nearest integer)

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