How many moles are in 12.04 x 1023 particles of O2 ?
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One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.
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12.04 x 10^23 / 6.02 x 10^23 = 2 moles
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