Question

The mass percent of hydrogen in hydrogen peroxide, h2o2, is

Answer 1

Answer: The mass percent of hydrogen in hydrogen peroxide is 5.88 %.

Explanation:

In $H_2O_2$, there are 2 hydrogen atoms and 2 oxygen atoms.

To calculate the mass percent of element in a given compound, we use the formula:

$\text{Mass percent of hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Molar mass of hydrogen peroxide}}\times 100$

Mass of hydrogen = $(1\times 2)=2g$

Mass of hydrogen peroxide = 34 g

Putting values in above equation, we get:

$\text{Mass percent of hydrogen}=\frac{2}{34}\times 100=5.88\%$

Hence, the mass percent of hydrogen in hydrogen peroxide is 5.88 %.

Answer 2

The atomic weight of H is 1, O is 16.
There are two of each in a hydrogen peroxide molecule.
(1*2)+(16*2)=2+32
2+32=34
The weight of the whole molecule is 34, and hydrogen makes up 2 of that.
(2/34)*100=0.0588235294*100
0.0588235294*100=5.88235294

The percentage mass of hydrogen in a hydrogen peroxide molecule is 5.88%