Two 5 molal solutions are prepared by
dissolving a non-electrolyte non-volatile
solute separately in the solvents X and Y.
The molecular weights of the solvents are
MX and MY , respectively where
. The relative lowering of
vapour pressure of the solution in X is “m”
times that of the solution in Y. Given that
the number of moles of solute is very small
in comparison to that of solvent, the value
of “m” is :
As we have learnt,
Expression of relative lowering of vapour pressure -
- wherein
Option 1)
Option 2)
Option 3)
Option 4)
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