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14 May, 10:16

How many molecules are there in 1 miligram Au?

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  1. 14 May, 10:19
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    30.11 * 10¹⁷ atoms

    Explanation:

    Given dа ta:

    Mass of Au = 1 mg (0.001 g)

    Number of molecules / atom = ?

    Solution:

    The given problem will solve by using Avogadro number.

    It is the number of atoms, ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

    The number 6.022 * 10²³ is called Avogadro number.

    For example,

    Number of moles of Au = mass / molar mass

    Number of moles of Au = 0.001 g / 197 g/mol

    Number of moles of Au = 5 * 10⁻⁶ mol

    Number of atoms:

    one mole = 6.022 * 10²³ atoms

    5 * 10⁻⁶ mol * 6.022 * 10²³ atoms / 1mol

    30.11 * 10¹⁷ atoms
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