Chemistry help please

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i need some help understanding this problem please.
How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?

  • Chemistry help please -

    N2 = 28 g/mol
    5O =5*16 = 80 g/mol
    so N2O5 = 108 g/mol

    32.4 g * 1 mol/108 g = .3 moles of N2O5
    that is 5*.3 = 1.5 moles of O
    1.5 * 6*10^23 = 9*10^23 atoms of O

    .6 moles of N
    .6*6*10^23 = 3.6*10^23 N atoms

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