The vapour pressure of benzene at a certain temperature is \[640\,mm\] of \[Hg\]. A non-volatile and non-electrolyte solid weighing \[2.175g\] is added to \[39.08g\] of benzene. The vapour pressure of the solution is \[600mm\] of \[Hg\]. What is the molecular weight of solid substance [CBSE PMT 1999; AFMC 1999]

The vapour pressure of benzene at a certain temperature is \[640\,mm\]

1.	The vapour pressure of benzene at a certain temperature is \[640\,mm\] of \[Hg\]. A non-volatile and non-electrolyte solid weighing \[2.175g\] is added to \[39.08g\] of benzene. The vapour pressure of the solution is \[600mm\] of \[Hg\]. What is the molecular weight of solid substance [CBSE PMT 1999; AFMC 1999]
A.	49.50
B.	59.6
C.	69.5
D.	79.8
Answer» D. 79.8

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