That's vapour pressure
When 20 gm solute is added to 72 gm water, vapour pressure of the solution is found to be 24 mm-Hg.
Now, 18 gm of water is added to the solution. Vapour pressure of the solution become 24.375 mm-Hg.
Find molecular weight of the solute.
Take the solute be solid, non-volatile, non-electrolytic, non-associated.
Write the answer in nearest integer.
The answer is 69.
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