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Atomic mass question?

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calculate the mass ratio of a bromine atom to an atom of

a) neon

b) calcium

c) helium

any help would be great!

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  1. Br = 79.904 amu

    Ne = 20.179 amu

    Ca = 40.08 amu

    He = 4.00260 amu

    Br:Ne = 3.9598:1

    Br:Ca = 1.994:1

    Br:He = 19.963:1


  2. Bromine has a atomic mass of 35

    Neon: 10

    Calcium: 20

    Helium: 2

    So the ratios are:

    Neon: 35:10 = 7:2

    Calcium: 35:20 = 7:4

    Helium: 35:2
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