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16 December, 14:04

How many atoms are there in 1.45 x 10-17 mol of arsenic?

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  1. 16 December, 16:05
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    1 mole of any substance contains 6.02x10^23 "units" of that substance. This is Avogadro's constant.

    Therefore to find the number of atoms you multiply the number of moles by this number.

    => 1.45x10^-17 x 6.02x10^23 = 8,730,000 atoms.
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