Question

The common laboratory solvent diethyl ether (ether) is often used to purify substances dissolved in it. The vapor pressure of diethyl ether, CH,CH,OCH CH3, is 463.57 mm Hg at 25°C. In a laboratory experiment, students synthesized a new compound and found that when 12.69 grams of the compound were dissolved in 183.3 grams of diethyl ether, the vapor pressure of the solution was 450.73 mm Hg. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight of this compound? diethyl ether-CH,CH,OCH CH2 = 74.12 g/mol. MW - g/mol

Answer 1

PSON TON = X SOLWENT PSOLVENT SOLVENT = 46 3. 57 mm Hg Psolution = 450.73 mm Hg # moles of solenrs 183.39 2047 mol 74.12 9 mort = LET ń BE No. of moles of compound. A ASOWENT = 2:47 (972:47) ::. 450.73 = 2:49 x 463.57 n+2.47 ai no 0.07 NO OF MOVES of compound - 0.07 moe MW of compound = 12.69 g =1181.29 g O. Of mol more