Using the data below (tabulated at 25 °C), what is the vapor pressure, in kilopascals (kPa), of a solution formed by mixing 5.37 mol of iodomethane (CH3I) with 4.27 mol of trichloromethane (CHCl3) at 25 °C? Assume ideal behavior. Substance Vapor Pressure (kPa) Iodomethane 53.9 Trichloromethane 26.2

The vapor pressure of chloroform is 173.11 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in chloroform is aspirin.Calculate the vapor pressure of the solution at 25 °C when 13.35 grams of aspirin, C9H8O4 (180.1 g/mol), are dissolved in 238.1 grams of chloroform.chloroform = CHCl3 = 119.40 g/mol.VP(solution) =  __________mm Hg

Pentane (C5H₁2) and hexane (C6H₁4) combine to form an ideal solution. At 25°C the vapor pressures of pentane and hexane are 513 and 152 torr, respectively. A solution is prepared by mixing 26 mL of pentane (density 0.63 g/mL) with 70. mL of hexane (density 0.66 g/mL). (a) What is the vapor pressure (in torr) of this solution? torr = = (b) What is the mole fraction of pentane in the vapor that is in equilibrium with this solution?

The common laboratory solvent chloroform is often used to purify substances dissolved in it. The vapor pressure of chloroform , CHCI3, is 173.11 mm Hg at 25 °C. In a laboratory experiment, students synthesized a new compound and found that when 7.339 grams of the compound were dissolved in 176.5 grams of chloroform, the vapor pressure of the solution was 170.01 mm Hg. The compound was also found to be nonvolatile and a non- electrolyte. What is the molecular weight of this compound? chloroform CHCI3 = 119.40 g/mol. %3D MW g/mol