How to Calculate Molality for a 0.5% Urea Solution at 0°C?

[shaiqbashir]

Molality creating problems for me!

calculate the molality and osmotica pressur of a 0.5% solution of urea (Mol Mass=60) in water at 0 degree celsius.

R-0.0821

now my dear friends!

i have calculated successfuly the osmotic pressure in this question which is

osmotic pressure = 1.86 atm

now the problem is this that how to calculate this molality. i know that

molality = no of moles of the solute/ mass of the solvent in kilograms

but you see that here i don't have any masss of the solute given at all.

Please help me

Thanks in advance

 

[Borek]

Such diluted solution has density almost identical with the density of pure water.