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18 May, 02:16

Calculate the number of moles of Cu in 3.8*10213.8*1021 atoms of Cu.

Express your answer using two significant figures.

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  1. 18 May, 04:13
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    6.3*10⁻³ moles of Cu

    Explanation:

    The relation is, that 1 mol of particles are contained by 6.02*10²³ particles.

    This is Avogadro's number that explains that: one mole determines the number of fundamental units that are contained in a constant number but they do not depend on the type of material or the type of particle, and this quantity is 6.02 * 10²³

    We can make a rule of three:

    6.02*10²³ atoms are contained 1 in mol of Cu

    Therefore, 3.8*10²¹ atoms will be contained in (3.8*10²¹. 1) / NA = 6.3*10⁻³ moles
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