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21 August, 11:15

A piece of pencil graphite (made of carbon atoms) has a mass of 0.12 grams. How many moles of carbon atoms are in the lead?

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  1. 21 August, 12:49
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    Moles = 0.01 mol

    Number of Atoms = 6.022 * 10²¹ Atoms

    Solution:

    Data Given:

    Mass = 0.12 g

    M. Mass of Carbon = 12.01 g. mol⁻¹

    Calculating Moles:

    As we know,

    Moles = Mass : M. Mass

    Putting values,

    Moles = 0.12 g : 12.01 g. mol⁻¹

    Moles = 0.01 mol

    Calculate Number of Atoms as,

    Moles = Number of Atoms : 6.022 * 10²³ Atoms. mol⁻¹

    Solving for Number of Atoms,

    Number of Atoms = Moles * 6.022 * 10²³ Atoms. mol⁻¹

    Putting value of Moles,

    Number of Atoms = 0.01 mol * 6.022 * 10²³ Atoms. mol⁻¹

    Number of Atoms = 6.022 * 10²¹ Atoms
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