If we have `10` molal urea solution, Calculate mole fraction of urea in this solution `&` also calculated `% W//W` of urea `(MW=60)`.

Explanation

`10` moles urea in `1000g` of water
`X_(urea)=(10)/(10+(1000)/(18))=(10)/(65.55)=0.1526`
`% w//w` weight of urea `=(10xx60)/(10xx60+1000)xx100=37.5%`
Note: For dil.aq. Solution molality `approx` molarity
molality `=("molarity"xx1000)/(1000xxd-"molarity"xxm)=(1g//ml)`