The compound K2O2, potassium peroxide, contains the greatest mass of oxygen. For every 1.00 gram of K2O2, there are 0.2624 grams of oxygen.
The compound K2O2 is potassium peroxide. Each formula unit of K2O2 contains two oxygen atoms. To determine the mass of oxygen in 1.00 gram of K2O2, we need to convert the mass of K2O2 to moles and then multiply by the molar ratio between oxygen and K2O2.
The molar mass of K2O2 is 122.25 g/mol. So, moles of K2O2 = 1.00 g / 122.25 g/mol = 0.00819 mol.
Since there are two oxygen atoms in each formula unit of K2O2, the total moles of oxygen = 0.00819 mol * 2 = 0.0164 mol.
The mass of oxygen in 1.00 gram of K2O2 = 0.0164 mol * 16.00 g/mol = 0.2624 grams.