5% urea solution is isotonic with 12.5% solution of an organic compound if the molcular mass of urea of 60 then calculate the molcular mass of that organic compound
Answers
5% urea solution is isotonic with 12.5% solution of an organic compound the molecular mass of the urea 60. The molecular mass of organic compound is 153.6 mol/L.
Step wise explanation is given below:
- it is given that the molecular mass of Urea is 60 and 5% urea solution is isotonic with 12.5% of the organic compound.
- let this organic compound be x
According to the ideal gas equation: PV = nRT
- Where p is the osmotic pressure,
V is the volume,
n is the no. of moles
R is the universal gas constant with a value equals to 8.314 J/mol K
and, T is the temperature.
- c = n/v where c is the concentration in mol/L
So, osmotic pressure = cRT
- Osmotic pressure of 5%(or 50g/L) solution of urea = (50/M urea)RT = (50/60)RT.
- Osmotic pressure of 12.8% solution of organic compound = (128/Moc)RT
- As per equation,
(50/60)RT = (128/Moc)RT
50/60 = 128/Moc
= 153.6mol/L