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16 August, 11:49

How many moles are in 12.013 x 10 ^24 atoms of helium?

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  1. 16 August, 12:04
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    19.948 mol.

    Explanation:

    Knowing that every one mole of a substance contains Avogadro's no. of molecules (NA = 6.022 x 10²³).

    Using cross multiplication:

    1.0 mole → 6.022 x 10²³ atoms of He.

    ? mole → 12.013 x 10²⁴ atoms of He.

    ∴ The no. of moles of are in 12.013 x 10²⁴ atoms of He = (12.013 x 10²⁴ atoms of He) (1.0 mole) / (6.022 x 10²³ atoms of He) = 19.948 mol.
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