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Chapter 48: Problem 2

How many electrons are transferred when: a) one Zn atom reacts with one \(\mathrm{Cu}^{2+}\) ion? b) one mole of \(\mathrm{Zn}\) reacts with one mole of \(\mathrm{Cu}^{2+} ?\)

Short Answer

Expert verified
a) 2 electrons are transferred when one Zn atom reacts with one Cu2+ ion. b) 2 moles of electrons are transferred when one mole of Zn reacts with one mole of Cu2+.

Step by step solution

01

Understanding the reaction between Zn and Cu2+

Zn has an electron configuration of \([Ar] 3d^{10} 4s^{2}\), so to achieve a stable electron configuration, it can lose 2 electrons to form Zn2+. On the other side Cu2+ has an electron configuration of \([Ar] 3d^{9}\), which means it needs 2 electrons to return to a neutral charge state, Cu. Therefore, when a Zn atom reacts with a Cu2+ ion, 2 electrons will be transferred from Zn to Cu2+.
02

Apply the reaction to one mole of atoms

When applying the above reaction to one mole of atoms, the same electron transfer will occur. This means for every mole of Zn and Cu2+, 2 moles of electrons will be transferred. This is because a mole is simply an amount of substance, and doesn't change the nature of the reactions occurring between the particles of that substance.

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Most popular questions from this chapter

If possible, rank the metal ions \(\mathrm{Ni}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Cr}^{3+}\), and \(\mathrm{K}^{+}\) in terms of their strength as oxidizing agents. If this is not possible, rank as many as you can and propose an experiment (or series of experiments) that would enable you to complete the rankings.
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