The Total solution for NCERT class 6-12
An aqueous solution of 2%non-volatile solute exerts a pressure of 1.004 bar at the normal boiling pointof the solvent. What is the molar mass of the solute?
Here,
Vapour pressure of the solutionat normal boiling point (p1) = 1.004 bar
Mass of solute, (w2)= 2 g
Mass of solvent (water), (w1)= 98 g
Molar mass of solvent (water), (M1)= 18 g mol−1
According to Raoult’s law,
= 41.35 g mol−1
Hence, the molar mass of thesolute is 41.35 g mol−1.