Hydrogen Peroxide to mol

Question

The disinfectant hydrogen peroxide (H2O2) decomposes to form water and oxygen gas. How much O2 will result from the decomposition of 3.47 mol of hydrogen peroxide?

Answer 1

2H₂O₂ ==> 2H₂O + O₂ .. balanced equation

Use stoichiometry of the balanced equation along with dimensional analysis to solve the problem:

3.47 mol H₂O₂ x 1 mol O₂ / 2 mol H₂O₂ = 1.74 mols O₂ formed

If you want the grams of O₂ formed, just convert the 1.735 mols to grams using molar mass of O₂:

1.74 mols O₂ x 32 g O₂ / mol = 55.7 g O₂ formed