Question

What is the mass of hydrogen peroxide in 1 l of 3m solution?

Answer 1

What is the mass of H2O2 present in 1 litre of a 2 M solu? Calculate the volume of oxygen at STp liberatedupon the complete decomposition of 100 cm3 ...

Answer 2

Answer : The mass of hydrogen peroxide in 1 L of 3 M solution is 102 grams.

Explanation :

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :

$\text{Molarity}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

In this question, the solute is hydrogen peroxide $(H_2O_2)$.

Now put all the given values in this formula, we get:

$3M=\frac{\text{Moles of solute}}{1L}$

$\text{Moles of solute}=1L\times 3M$

$\text{Moles of solute}=3moles$

The number of moles of hydrogen peroxide is, 3 moles.

Now we have to calculate the mass of hydrogen peroxide.

$\text{Mass of }H_2O_2=\text{Moles of }H_2O_2\times \text{Molar mass of }H_2O_2$

Molar mass of hydrogen peroxide = 34 g/mole

$\text{Mass of }H_2O_2=3moles\times 34g/mole=102g$

Therefore, the mass of hydrogen peroxide in 1 L of 3 M solution is 102 grams.