Question: how many atoms are in one mole of hydrogen peroxide h2o2?
Answer: That is 1 mole or 207.2 grams of Pb contains 602,000,000,000,000,000,000,000 atoms of Pb. The sum of individual atoms can be used to find the mass of a molecule. The mass of hydrogen peroxide, H2O2 would be calculated like this: H2O2 has 2 hydrogen atoms and 2 oxygen atoms in it.