A glucose solution which boils at `101.04^(@)C` at 1 atm. What will be relative lowering of vapour pressure of an aqueous solution of urea which is equimolal to given glucose solution? (Given: Kb for water is 0.52 K kg `mol^(-1)`)

Explanation

`ΔTb = K_(f)m ΔTb = 101.04-100 = 1.04 ""_(@)C`
or `m= 1.04 //0.52 = 2`
Relative lowering of `VP = x2`
Relative lowering of `VP = n2//n1+n2`
` = 2// 2+55.5 = 2//57.5 = 0.034 atm`