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3 moles of P and 2 moles of Q are mixed...

3 moles of P and 2 moles of Q are mixed , what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively ?

A

80 torr

B

140 torr

C

72 torr

D

70 torr

Text Solution

Verified by Experts

The correct Answer is:
C
Mole fraction of P = `3/(3+2)`=0.6
Mole fraction of Q =`2/(3+2)`=0.4
`P_"total"=p_P+p_Q=p_P^@ x_P+p_Q^@x_Q`
=80 x 0.6 + 60 x 0.4 = 72 torr.
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