The vapoorpressureofa5% aqueous solution of a non-volatine organic sub

1.	The vapoorpressureofa5% aqueous solution of a non-volatine organic substance at 373K is745 mm. Calculate the molar mass of the solute
Answer» 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

The vapoorpressureofa5% aqueous solution of a non-volatine organic substance at 373K is745 mm. Calculate the molar mass of the solute

Answer»

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