Calculate the mole fraction of solute in solution if vapour pressure of a solution and pure solvent are 27 mm Hg and 30 mm Hg respectively at 298 K.

Step-by-step solution

According to Raoult's law, the relative lowering of vapour pressure is equal to the mole fraction of the solute. P^0 - P_s P^0 = x_ solute Given P^0 = 30 mm Hg and P_s = 27 mm Hg . x_ solute = 30 - 27 30 x_ solute = 3 30 = 0.1 Answer: 0.1