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Question: 3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if...

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 torrrespectively?

A

80 torr

B

140 torr

C

72 torr

D

70 torr

Answer

72 torr

Explanation

Solution

Mole fraction of P=33+2=0.6P = \frac { 3 } { 3 + 2 } = 0.6

Mole fraction of

=80×0.6+60×0.4=72= 80 \times 0.6 + 60 \times 0.4 = 72 torr