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How many moles of O2 are there in 1.20 × 1022 oxygen molecules?
Number of molecules of oxygen = 1.20 × 1022
One mole of oxygen contains 6.022 × 1023 molecules.
1.20 × 1022 molecules of oxygen contain = (1.20 × 1022 ) / (6.022 × 1023 ) = 0.01099 moles.
Therefore, 1.20 × 1022 molecules of oxygen contain 0.01099 moles of oxygen.
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