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How many moles of magnesium is 1.25 x 1023 atoms of magnesium?
A. 0.208 × 101 mol Mg
B. 2.08 × 101 mol Mg
C. 2.08 × 10 -1 mol Mg
D. 20.8 mol Mg

I think it would be D

  • chemistry -

    Think a little more..

    you have 1.25e23 atoms, and there are 6.02e23 atom in one mole. dividing the first by the second yields 2.08e-1 mol Mg

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