Question

Molarity 18% solution of urea is

Answer 1

remember urea=CH4N20
molar mass of urea=60

18% solution means=18g urea in 1 litre

moles of urea=18/60=0.3

molarity=0.3

Answer 2

Molar mass of urea= 60

18•/• w/v means 18gram of urea in 100mL

Moles of urea = 18/60

= 0.3 moles

Volume in liters = 100/1000

= 0.1L

Molarity= moles of a solute/ volume of solution in liters

So,

Molarity = 0.3/0.1

= 3M