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A mole is 6.022×1023 of anything, including atoms. So to determine the number of atoms are in 30 moles of iron, you multiply the number of moles times 6.022×1023.
30mol Fe x 6.022×1023 atoms Fe/1mol Fe = 1.8066×1025atoms Fe
When corrected for significant figures, the answer is 2×1025atoms Fe.
Note: the number following the 10 in the large numbers is the exponent on the 10 and should be written as superscripts, but that is not supported at the moment.
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