Question

The
vapoor
pressure
of
a
5% aqueous solution of a non-volatine organic substance at 373K is
745 mm. Calculate the molar mass of the solute
​

Answer 1

Answer:

47.5 gram Approx

5%solution

Solute - 5gram

solvent - 95 gram (H2O)

Use Formula

Pa° -Ps/Pa° = XB

Pa° - 760

PS - 745

Xb = mole fraction of Solute

15/760 = nB/nA + nB

nA /nB = 50

nA = 95/18

nB = 5/M

M = 47.5 gram