Molality creating problems for me!!!!

[shaiqbashir]

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 donot 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.

Best,
Borek
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