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)

Liquids 'X' and 'Y' form an ideal solution. The vapour pressure of pure 'X' and pure 'Y' are 120 mm Hg and 160 mm Hg respectively. Calculate the vapour pressure of the solution containing equal moles of 'X' and 'Y'.