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Oxygen in the form O2 has a molar mass of 31.9988 gmol-1. In one gram there will be 1/31.9988 mol = 0.0313 mol. One mole of O2 equals 6.022 x 1023 molecules of oxygen, and thereby 1.88 x 1022 molecules of O2 in 1 gram. Since O2 is diatomic there are twice as many atoms as there are molecules and the final calculation to determine the number if atoms is 1.88 x 1022 * 2 = 3.76 x 1022 atoms of oxygen.

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