Question

In a given sample of $H_2O_2$ each 100 mL of solution contains 68 mg of $H_2O_2$. The molarity of the solution is

• A. 0.02 M
• B. 0.2 M
• C. 2M
• D. 20 M

Answer 1

Answer: (A)

0.02 M

Answer 2

Molarity $=\frac{\text{Mass of solute in g in 1 L of solution}}{\text{Mol. Mass}}$ $=\frac{68 \times1000}{1000\times100} \times \frac{1}{34}$ $=0.02\,M$