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Q.

Vapour pressure of chloroform (CHCI3) and dichloromethane (CH2Cl2) at 25o C are 200 mm of Hg and 41.5 mm of Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at the same temperature will be (Molecular mass of CHCI3 = 119.5 u and molecular mass of CH2Cl2 - 85 u)

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a

173.9 mm Hg

b

615.0 mm Hg

c

347.9 mm Hg

d

90.63 mm Hg

answer is D.

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Detailed Solution

Number of moles of CHCI3,                nA=wM=25.5119.5=0.213Number of moles of CH2Cl2               nB=4085=0.47Mole fraction of CHCI3,             xA=nAnA+nB=0.2130.683=0.31Mole fraction of CH2Cl2              xB=1−xA=1−0.31=0.69ptotal =pAxA+pBxB         =200×0.31+41.5×0.693         =62+28.63=90.63mmHg
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