# An aqueous solution of 2% non volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molecular mass

0 votes
54 views

closed
An aqueous solution of 2% non volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molecular mass of the solute ?

## 1 Answer

0 votes
by (99.3k points)
selected

Best answer
Relative lowering of vapour pressure (P_(0)-P_(s))/(P_(0))=(n_(s))/(n_(0))
P_(0)=1.013" bar",P_(s)=1.004" bar"
w = 2 gms W = 98 gms
M = 18 m = ?
(1.013-1.004)/(1.013)=(2xx18)/(m xx98)
m=(2xx18xx1.013)/(0.009xx98)=(36xx1.013)/(0.882)
=41.35" gms"//"mole".

0 votes
1 answer
0 votes
1 answer
0 votes
1 answer
+1 vote
1 answer
0 votes
1 answer