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Q.

At 25°c, Vapour Pressure of Pure benzene and pure toluene are 93.4 and 26.9 torr respectively. A solution is prepared by mixing 60g benzene and 40g of toluene. What pressure should be maintained in the flask containing this solution so that it start boiling at 25° C.

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a

6.93 mm

b

69.327 mm

c

0.693mm

d

693.27 mm

answer is C.

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Detailed Solution

P=PA0XA+PB0XB;XA=6078/6078+4092=0.639XB=0.361P=69.393mm

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At 25°c, Vapour Pressure of Pure benzene and pure toluene are 93.4 and 26.9 torr respectively. A solution is prepared by mixing 60g benzene and 40g of toluene. What pressure should be maintained in the flask containing this solution so that it start boiling at 25° C.