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4 December, 12:00

A match has about 21 milligrams of red phosphorus coating the tip. How many atoms of phosphorus is this?

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  1. 4 December, 15:50
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    4.083 * 10^20 atoms.

    Explanation:

    One Mole of phosphorus contains 6.022 * 10^23 atoms (Avogadros number) '

    Since 1 mole of Phosphorus has a mass of 30.974 grams, 21 milligrams has

    6.022 * 10^23 * 0.021 / 30.974

    = 0.004083 * 10^23

    = 4.083 * 10^20
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