Question

27) The cycle of copper reactions illustrates important principles of chemical reactions. The cycle begins with elemental copper, which in a first reaction is oxidized to copper(II) cation. Copper(II) is then carried through different solid forms. In the last step, copper(II) cation is reduced, the copper metal is regenerated, and the cycle is closed. The five key steps are (see attached picture). Assume that you want to carry out a sequence of cycle reactions. 

By how much is zinc oxidized in the fifth reaction?

 

1. ЗСu(s) + 2NO3 + 8H*
2. Cur (аq) + 20Н (аq) — Сu(ОН), (s)
3. Cu(ОН), (s)
ЗСи* (аq) + 4Н2О + 2NO
— СuО(s) + H2O
(аq) + HэО
Zn2(aq) Cu(s)
4. CuO(s)2H Cu2
2+
5. Cu" (аq) + Zn(s

Image Transcription

1. ЗСu(s) + 2NO3 + 8H* 2. Cur (аq) + 20Н (аq) — Сu(ОН), (s) 3. Cu(ОН), (s) ЗСи* (аq) + 4Н2О + 2NO — СuО(s) + H2O (аq) + HэО Zn2(aq) Cu(s) 4. CuO(s)2H Cu2 2+ 5. Cu" (аq) + Zn(s

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