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Mathematics 11 Online
OpenStudy (anonymous):

It is well known that the element magnesium has three naturally occurring isotopes. Mg-24 represents 79.0% of all magnesium atoms, Mg-25 accounts for 10.0%, and Mg-26 is the remaining 11.0%. If you have 226. atoms of magnesium, how many should be Mg-24?

OpenStudy (anonymous):

it would be 226 multiplied by 79% (.79) which comes out to be 178.54 again, without sig figs

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