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Estimate the number of atoms in 7.827 g of iron using the mass of an atomic mass unit (1.661 x 10^-27). The atomic mass of Fe is 55.85 u.

  • chemistry -

    You are ignoring units.

    mass of iron is in grams.
    atomic mass is in grams.
    amu is in kg.
    So you have an incompatability in units.

    number atoms= massiron/(massofeach atom)

    where mass ofeach atom=55.85u*mass/u

    so fix the units to be compatable, and you have it.

  • chemistry -

    that is my problem i am not sure how to fix the units. Do I divide the grams by 1000 so i would have 0.007927 grams then multiply by 55.85? Thank you so much for any help.

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