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6 August, 13:16

How many moles of argon are present if there are 1.23 x 10^20 atoms?

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  1. 6 August, 13:53
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    2.04*10⁻⁴ moles of Ar

    Explanation:

    We begin from this knowledge:

    1 mol of substance has 6.02*10²³ particles

    Let's solve this by a rule of three:

    6.02*10²³ atoms are contained in 1 mol of Ar

    1.23*10²⁰ atoms must be contained in (1.23*10²⁰. 1) / 6.02*10²³ =

    2.04*10⁻⁴ moles of Ar
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