The vapor pressure of benzene at certain temperature is 640mm Hg. To 39.08 of benzene, non-volatile and non-electrolyte solid-weighing 2.175g was added. The vapor pressure of solution was 600mm of Hg. Find the mass of the solute?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

                                                         Po - Ps = Po x2
                                                                 640-600= {640 x 2.175/ M}/ 39.0/ 78.0
                                                     40 = {1392/ M} x ½
                                                    40 = {696 / M}
                                                    M = 696/40 = 17.4g mol-1

Answered by  | 4th Jun, 2014, 03:23: PM