Weight percentage is usually used to find the relative atomic mass of an element, which can change because of naturally occuring isotopes (same number of protons, different number of neutrons)
if 50% weigh 5 and 50% weigh 7 then your average weight will be 6.How do you calculate weight percentage of a composition given atom percentage?
Example. Weight 20 70%. 25 30%
If you have 100 atoms, 70 of them weigh 1400 total, and 30 of them weight 750 total.
Total weight = 1400 + 750 = 2150.
Average weight = 21.5
Easy!
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