Question

The boiling point of diethyl ether, CH,CHOCH.CH3, is 34.500 °C at I atmosphere. Ky(diethyl ether) = 2.02 °C/m In a laboratory experiment, students synthesized a new compound and found that when 11.14 grams of the compound were dissolved in 298.6 grams of diethyl ether, the solution began to boil at 34.584 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound? g/mol Submit Answer Retry Entire Group 1 more group attempt remaining

Answer 1

Elevation of boiling point (AT) and malality of of a solution for a non-electrolyte salute are related, as follows: AT = Kg xm . There, LO Kg = malal boiling point constant. Geven thaly m=malality of the solution mass of solute (in gm) AT=(34.584 – 341500)°c - malar mass x mass at solvent - of salute (in kg) os, AT = 0.084°C - Kb=2.02 c/m =2.02°C kg/mole Mass at salute = 11:14 gm Mass of solvent = 298.69m = 0. 2986 kg . 8. Eqt o becomes - R AT = kg om v 11.14gm - or, 0.0840 = 2:02 Cymolt molar mass x 0.2986kg al solute = or, Malar mass of solute 2.02 X 11.14 0.084 x 0.2986 om Imole = 897,15 gm/mode. 8 Molecular weight or malar mass = 1897.15 gm /male