How many moles are 5.55 x 10^25 atoms of mg?
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6.02×10²³ atoms contains 1mole( by Avogadro's law)
1 atoms contains 1/6.02×10²³ mole
5.5×10^25 atoms contains= 5.5×10^25/6.02×10²³
=91.36moles of Mg
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