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Question
The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile non-electrolyte solid weighing 0.5 g is added to 39.0 g of benzene (molar mass 78g/mol). The vapour pressure of the solution then is 0.845 bar. What is the molecur mass of the solid substance ?
Options
A.58
B.180
C.170
D.145
Solution
pobenzene = 0.850bar ; Wbenzene = 39.0 g.
M. W. = 78g g/mol.
pobenzene = 0.850bar w = 0.5 g.
Let n be the. of, oles of non volatile solid; w and m be the weight of solid and molecular mass respectively.
Using,
m
= 170
M. W. = 78g g/mol.
pobenzene = 0.850bar w = 0.5 g.
Let n be the. of, oles of non volatile solid; w and m be the weight of solid and molecular mass respectively.
Using,
m
= 170Create a free account to view solution
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