A solution containing 30 gms of non-volatile solute in exactly 90 gm water has a vapour pressure of 21.85 mm Hg at \[{{25}^{o}}C\]. Further 18 gms of water is then added to the solution. The resulting solution has a vapour pressure of 22.15 mm Hg at \[{{25}^{o}}C\]. Calculate the molecular weight of the solute [UPSEAT 2001]

A solution containing 30 gms of non-volatile solute in exactly 90 gm w

1.	A solution containing 30 gms of non-volatile solute in exactly 90 gm water has a vapour pressure of 21.85 mm Hg at \[{{25}^{o}}C\]. Further 18 gms of water is then added to the solution. The resulting solution has a vapour pressure of 22.15 mm Hg at \[{{25}^{o}}C\]. Calculate the molecular weight of the solute [UPSEAT 2001]
A.	74.2
B.	75.6
C.	67.83
D.	78.7
Answer» D. 78.7

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