Balance the following equation by redox method h2s + h2 o2 gives s + h2o

Find the oxidation state for each element.

The oxidation state of H is +1 in most compounds.

Changes in oxidation states:

Each S atom will reduce two O atoms. There are two O atoms in each H₂O₂ molecule. There's only one S atom in each H₂S molecule. As a result, pairing one H₂O₂ with one H₂S will balance the change in oxidation state.

Each H₂O₂ contains two O atoms. The two O atoms will produce two H₂O molecules. Each H₂S molecule will lead to one S molecule. Thus the coefficient for H₂O will be two and the coefficient for the rest three species will be one.

it means there are 3 atoms of oxygen

the answer is 75.0%.