Question

Boiling point of a 2% aqueous solution of a non-volatile solute A is equal to the boiling point of 8% aqueous solution of a non-volatile solute B. The relation between molecular weights of A and B is ______.

पर्याय

• M_A = 4M_B

• M_B = 4M_A

• M_A = 8M_B

• M_B = 8M_A

Answer 1

Boiling point of a 2% aqueous solution of a non-volatile solute A is equal to the boiling point of 8% aqueous solution of a non-volatile solute B. The relation between molecular weights of A and B is M_B = 4M_A.

Explanation:

`Delta_"A""T"_"b" = 2/("M"_"A" xx 100) xx 1000 xx "K"_"b"`

`Delta_"B""T"_"b" = 8/("M"_"B" xx 100) xx 1000 xx "K"_"b"`

Given, `Delta_"A""T"_"b" = Delta_"B""T"_"b"`

`=> 2/"M"_"A" = 8/"M"_"B"`

= M_B = 4M_A