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A solution prepared by dissolving 1.25 g...

A solution prepared by dissolving 1.25 g of oil of winter green (methyl s.ilicylate) in 99.0 g of benzene has a boiling po . int of `80.31^(@)` C , Determine the molar mass of this compound. (B.P. of pure benzene = `80.10^(@)`C and `K_(b)` for benzene = ` 2.53^(@) C " Kg " mol^(-1)` )

Text Solution

Verified by Experts

`Delta T_(b) = (80.31 = 80.10)^(@)` C
= `0.21^(@) C or 0.21` K
`Delta T_(b) = K_(b)` m
`0.21^(@) C = 2.53^(@)`C kg `mol^(-1) xx (1.25 g)/(M) xx (1000)/(99 kg)`
M = 152 g `mol^(-1)`
Where M is molar mass of the solute.
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