Published by:
CGP EDU Academic Team
Published on: August 14, 2026
80 mole percent of MgCl 2 is dissociated in aqueous solution. The vapour pressure of 1. 0 molal aqueous solution of MgCl 2 at 38°C is_____mm Hg. (Nearest integer)
Given: Vapour pressure of water at 38°C is 50 mm Hg
Text Solution
Verified by ExpertsThe correct answer is:
48
(48) One molal solution means one of solute present in one kg of solvent.
MgCl 2 
Mg 2+ + 2 Cl -
1 0 0
1-0.8 0.8 1.6
Hence, overall moles after dissociation =2.6
The relative lowering of vapour pressure
For dilute solution
p = 47. 66 
48 mm Hg
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