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The vapour pressure of two liquid P and Q are 80 torr and 60 torr respectively. The total vapour pressure obtained by mixing `3` moles of P and 2 mole of Q would be
A. `69=8 "torr"`
B. `20 "torr"`
C. `140 "torr"`
D. `72 "torr"`

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Correct Answer - D
`P_(M) = P_(1)^(@).X_(1)+P_(2)^(@).X_(2)`
`= 80 xx (3)/(3+2)+60 xx (2)/(3+2) = 72 "torr"`

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