Question

H2O2 solution used for hair bleaching is sold as a solution of approximately 5.0 gm H2O2 per 100 ml of this solution. The molecular mass of H2O2 is 34. The molarity of this solution is approximately :-

Answer 1

Answer : The morality of the solution is, 1.47 M

Solution : Given,

Mass of $H_2O_2$ = 5 g

Molar mass of $H_2O_2$ = 34 g/mole

Volume of solution = 100 ml

Formula used :

$\text{Molarity of solution}=\frac{\text{Mass of }H_2O_2}{\text{Molar mass of }H_2O_2\times \text{Volume of solution in liters}}\times 1000$

Now put all the given values in this formula, we get the molarity of the solution.

$\text{Molarity of solution}=\frac{5g}{34g/mole\times 100ml}\times 1000=1.47mole/L=1.47M$

Therefore, the morality of the solution is, 1.47 M

Answer 2

Answer:

The molarity of this solution is approximately 1.5 mol/L.

Explanation:

Mass of hydrogen peroxide =  5.0 g

Molar mass of hydrogen peroxide =-34 g/mol

Volume of hydrogen peroxide solution = 100 ml = 0.1 L

$Molarity=\frac{\text{Mass of the compound}}{\text{Molar mass of compound}\times \text{Volume of solution}}$

$Molarity=\frac{5.0 g}{34 g/mol\times 0.1 L}=1.4705 mol/L\approx 1.5 mol/L$

The molarity of this solution is approximately 1.5 mol/L.