Question

Calculate the no of moles is present in 19 gm of H2O2

Answer 1

Explanation:

Given mass=19gm

Molar mass=1×2+16×2=34

No of moles=Given mass/Molar mass

=19/34

=0.55

There are 0.55 moles in 19 gm of H2O2.

Answer 2

Given: 19 grams of $H_2O_2$.

To find: We have to find the number of moles.

Solution:

To determine the number of moles we have to follow the below steps-

The chemical formula of hydrogen peroxide is $H_2O_2$.

The atomic number of H is 1 and the atomic number of Oxygen is 16.

Thus the molecular weight of hydrogen peroxide is 2×1+16×2=34 grams.

34 grams of hydrogen peroxide occupy 1 mole.

So, 19 grams of hydrogen peroxide will occupy 19/35=0.54 moles.

Thus, 19 grams of $H_2O_2$ will contain 0.54 moles.