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The vapour pressure of two liquids X and...

The vapour pressure of two liquids X and Y are 80 and 60 Torr respectively. The total vapour pressure of the ideal solutions obtained by mixing 3 moles of X and 2 moles of Y would be

A

a) 68Torr

B

b) 140Torr

C

c) 48Torr

D

d) 72Torr

Text Solution

Verified by Experts

The correct Answer is:
D
Moles of X, `n_x=3/(3+2)=3/5`
Moles of Y, `n_y=2/(3+2)=2/5`
`P_t=p_xn_x+p_yn_y`
`=80 times 3/5 +60 times 2/5`
`=48 +24=72 Torr`
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