What is the total vapour pressure of an ideal solution at 45°C prepared by mixing benzene and octane in a molar ratio of 3:2? [At 45°C, the vapour pressure of pure benzene is 280 mm Hg and that of pure octane is 420 mm Hg.]

If a 200 mL aqueous solution containing 10 g NaOH is prepared, find the molarity of the resulting solution. (Molar mass of NaOH = 40 g/mol)

A 5.13% (w/v) cane sugar solution (molar mass = 342 g/mol) is isotonic with a 0.9% (w/v) solution of an unknown non-dissociating solute. The molar mass of the solute (in g/mol) is: