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14 October, 01:04

A chemist pours 1 mol of zinc granules into one beaker and 1 mol of zinc chloride powder into another beaker. What do the two samples have in common?

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  1. 14 October, 01:17
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    Answer is: two samples have in common same amount of substance and same number of particles.

    1) There are same amount of substance in both beakers:

    n (Zn) = 1 mol.

    n (ZnCl ₂) = 1 mol.

    2) There are same number of particles (atoms, molecules, ions) in both beakers:

    N (Zn) = n (Zn) · Na.

    N (Zn) = 1 mol · 6.023·10²³ 1/mol = 6.023·10²³ atoms of zinc.

    N (ZnCl₂) = n (ZnCl₂) · Na.

    N (ZnCl₂) = 1 mol · 6.023·10²³ 1/mol = 6.023·10²³ molecules of zinc (II) chloride.

    Na - Avogadro number.
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