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 when added to 39.0 g of benzene (molar
mass 78 g mol-?). Vapour pressure of the
solution, then, is 0.845 bar. What is the molar
mass of the solid substance ?
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Answer 1

Explanation:

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolye solid weighing 0.5 g is added to 39.0 g of benzene (molar mass 78 g/mol). The vapour pressure of the solution then is 0.845 bar.

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