FInd the molality of a solution containing a non-volatile solute if the vapour pressure is 2% below the vapour pressure of pure water.

Dear student,

To figure out the molarity of a solution, simply work out the number of moles of the solute (Probably from the molecular weight) and divide by the weight of the solvent. It's probably the case that you're given a volume of solvent rather than the weight: use the density to convert between the two

molality (M) = moles solute/kg of solution

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All the best.

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Sagar Singh

B.Tech, IIT Delhi