Question

A 20 mL sample of human urine was found to have 10 mg of
urea during analysis. The molar mass of urea is 60.1 g/mol.
Calculate the molarity of urea in the given sample.

Answer 1

0.008
Molarity=
Mw
2
​
×V
sol
​
(in mL)
W
2
​
×1000
​
⟹W
2
​
=5 mg =5×10
−3
g
∴M=
60×10
5×10
−3
×10
3

​
=0.008