Two liquid A & B form an ideal solution. What is the vapour pressure of solution containing 2 moles of A and 3 moles at B at 300K? [Given: At 300K, Vapour pr. Of pure liquid A`("P"_("A")^(@))`=100 torr, Vapour pr. Of pure liquid B`("P"_("B")^(@))`= 300 torr]

Options

A. 200 torr
B. 140 torr
C. 180 torr
D. None of these

Answer

D

Explanation

`"x"_("A")=2//5`
`"P"_("solution")="x"_("A")("P"_("A")^(0)-"P"_("B")^(0))+"P"_("B")^(0)`
`=(2)/(5)(100-300)+300`
220torr