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In 8 mg Magnesium is:

8(mg) / 24.31(mg/mmole) = 0.329 mmole Mg

(molar mass Mg being 24.31 mg/mmole)

In 0.329 mmole Mg is:

0.329(mmole) * 6.02*1023(atoms/mole)*10-3(mole/mmole) =

= 1.98*1020 atoms of Mg.

(Avogadro's Number being 6.02*1023)

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