Question

A non-volatile solute 'X' (molar mass = 50 g mol⁻¹) when dissolved in 78g of benzene reduced its vapour pressure to 90%. Calculate the mass of X dissolved in the solution.

Calculate the boiling point elevation for a solution prepared by adding 10g of MgCl₂ to 200g of water assuming MgCl₂ is completely dissociated. (Kb for Water = 0.512 K kg mol⁻¹, Molar mass MgCl₂ = 95g mol⁻¹)

Why is the value of Van't Hoff factor for ethanoic acid in benzene close to 0.5 ?

When 25.6g of Sulphur was dissolved in 1000g of benzene, the freezing point lowered by 0.512 K. Calculate the formula of Sulphur (Sx). (Kf for benzene = 5.12 K kg mol⁻¹, Atomic mass of Sulphur = 32g mol⁻¹)

At 25 °C the saturated vapour pressure of water is 24 mm Hg. Find the saturated vapour pressure of a 5% aqueous solution of urea at the same temperature. (Molar mass of urea = 60 g mol⁻¹)