117) Calculate the molal elevation constant of water that evaporates at 100^oC with the absorption of 536 cal⁄gm: (R = 2 cal)

118) 15 gm of methyl alcohol is dissolved in 35 gm of water. What is the mass percentage of methyl alcohol in solution?

119) Osmotic pressure of a sugar solution at 24^oC is 2.5 atm. Determine the concentration of the solution in gm mol⁄L:

120) 20 gm of a substance was dissolved in 500 mL of water and the osmotic pressure of the solution was found to be 600 mm of Hg at 15^oC. Determine the molecular weight of the substance:

121) 0.15 gm of a substance, dissolved in 15 gm of solvent, was boiled at a temperature higher by 0.216^oC than that of the pure solvent. Calculate the molecular weight of the substance: (Molal elevation constant for the solvent = 2.16^oC)