7.A sample of oxygen gas, O2 weighs 28.4 grams. How many molecules of O2 and how many atoms of O are present in this sample?

Question

7.A sample of oxygen gas, O2 weighs 28.4 grams. How many molecules of O2 and how
many atoms of O are present in this sample?

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Ngọc Hoa 4 months 2021-07-17T09:08:23+00:00 1 Answers 37 views 0

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    2021-07-17T09:09:29+00:00

    Answer:

    5.34275*10²³

    Explanation:

    Molar mass of O2 is 32g/mol

    mass of the sample is 28.4g

    number of moles = (mass of the sample) / (molar mass of O2)

    =28.5g / 32g/mol

    =0.8875mol

    number of molecules = number of moles * Avogadro’s Constant

    = 0.8875 * (6.02*10²³)

    = 5.34275 molecules

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