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1 February, 10:39

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?

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  1. 1 February, 12:34
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    Multiply the number of atoms by the % of Mg-24 and round to the closest integer.

    226 * 79.0% = 178.54 = 179
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