Question

solution A is obtained by dissolving 1g urea in 100 g water. solution B is obtained by dissolving 1g glucose in 100 g water. Which will have higher boiling point ? why ?

Answer 1

The elevation in boiling point is directly proportional to the molality of the solute added as 'i' is one for both. As the mass of solvent for both the solutions is the same and therefore
the increase in boiling point depends on the moles of each solute present.
Moles of urea = 1/60 = 0.017moles and mole of glucose = 1/180 = 0.0056mol
The solution of urea will show a hiher increase in boiling point.

Answer 2

The elevation in boiling point is directly proportional to the molality of  the solute added as $' i '$ is one for both.  As The mass of solvent for both the solutions is the same  and therefore

The increase in boiling point depends on the moles of each solute present.

Moles of urea = 1/60 = 0.017moles  

Mole of glucose =  1/180 = 0.0056moles

The solution of urea will show a higher increase in boiling point.

Since the boiling point is directly proportional to the vapor pressure of solvent if more particle will be added to the solvent , boiling point will increases .

Since the no of mole of urea will be greater than glucose . hence urea solution will have more boiling point.

#SPJ2