133) The osmotic pressure of urea solution is 500 mm of Hg at 10^oC. If the solution is diluted and temperature is raised to 25^oC, the osmotic pressure decreases to 105.3 mm of Hg. What is the extent of dilution?

134) Benzene and toluene form nearly ideal solutions. At 20^oC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20^oC for a solution containing 78 gm of benzene and 46 gm of toluene in torr is:

135) Two solutions of a substance are mixed in the following manner: 480 mL of 1.5M of solution 1 + 520 mL of 1.2M of solution 2. What is the molarity of the final mixture?

136) 18 gm of glucose is added to 178.2 gm of water. The vapour pressure of water for this aqueous solution at 100^oC is:

137) Which of the following liquid pairs shows a positive deviation from Raoult′s law?