Question

6.02 x 1020 molecules of urea are present in 100 ml solution. The concentration of urea solution is
(1) 0.1 M
(2) 0.01 M
(3) 0.02 M.
(4) 0.001 M​

Answer 1

Explanation:

Molarity -

Molarity (M) = (Number of moles of solute)/(volume of solution in litres)

- wherein

It is defined as the number of moles of the solute in 1 litre of the solution.

No. of molecules (given) =

No. of moles =

Volume of solution=100 ml= 0.1 L

Therefore, Molarity=

Option 1)

0.01 M

This option is correct

Option 2)

0.001M

This option is incorrect

Option 3)

0.1M

This option is incorrect

Option 4)

0.02M

This option is incorrect