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Chemistry Question.????Help me.?

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Mg has 3 isotopes.

24

Mg 23.9850 amu 78.99%

25

Mg 24.9858 amu 10.00%

26

Mg 25.9826 amu 11.01%

How do I find the average atomic mass(amu)?

Please,i dont get this?

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  1. 23.9850( 78.99) + 24.9858( 10.00) + 25.9826 ( 11.01) / 100

    = 1894.575 + 249.858 + 286.068 / 100 =

    = 24.3050 amu

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