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budwilkins
each and every mole of any substance = Avogadro's Number of them
[tex] = 6.023 \times {10}^{23} \\ 4.0moles \: O2 \times \frac{6.023 {10}^{23}molecules }{1mole} \\ = 2.41 \times {10}^{24} \: molecules \: of \: O2[/tex]

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