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1 mole Fe = 6.022 x 1023 atoms Fe

1 mole Fe = 55.845g Fe (atomic weight in grams)

Convert grams Fe to moles Fe.

400g Fe x (1mol Fe/55.845g Fe) = 7.16mol Fe

Convert moles Fe to atoms Fe.

7.16mol Fe x (6.022 x 1023atoms Fe/1mol Fe) = 4.31 x 1024 atoms Fe

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