Relative lowering in vapour pressure of a solution containing a non-volatile solute is the ratio of:
- ANumber of moles of solute to number of moles of solvent.
- BNumber of moles of solvent to total number of moles of solution.
- CNumber of moles of solvent to number of moles of solute.
- DNumber of moles of solute to total number of moles of solution.
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The vapour pressure of benzene at a certain temperature is $640 \, mm$ of $Hg$. $A$ non-volatile and non-electrolyte solid weighing $2.175 \, g$ is added to $39.08 \, g$ of benzene. The vapour pressure of the solution is $600 \, mm$ of $Hg$. What is the molecular weight of the solid substance?
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