Question

If 6.02 x 10 molecules of urea are present in 100ml of its solution, then calculate the concentration of urea solution.​

Answer 1

Answer:   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) = 6.02 \times 10^{20}

No. of moles = \frac{6.02 \times 10^{20}}{6.02\times 10^{23}}= 10^{-3} \: mol

Volume of solution=100 ml= 0.1 L

Therefore, Molarity=\frac{no. \: of \: moles}{volume}

                             \frac{10^{-3}}{0.1} \: = 0.01 M

 

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