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Asked Oct 15, 2019
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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. 

How many grams of zinc metal are needed to completely regenerate 2.63g of copper in the fifth step in the cycle?

3Cu2 (aq)4H20 2NO
Cu(OH)2(s)
1. ЗСи(s) + 2NO; + 8H-
2+
2. Cu (aq) 20H (aq)
Cu(OH)2 (s) CuO (s) H20
4. CuO(s)2H Cu2
Cu2 (aq)Zn(s)
(aq)H2O
Zn2 (aq)Cu(s)
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3Cu2 (aq)4H20 2NO Cu(OH)2(s) 1. ЗСи(s) + 2NO; + 8H- 2+ 2. Cu (aq) 20H (aq) Cu(OH)2 (s) CuO (s) H20 4. CuO(s)2H Cu2 Cu2 (aq)Zn(s) (aq)H2O Zn2 (aq)Cu(s)

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Expert Answer

Step 1

Given:

Mass of Cu = 2.63 g.

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Cu*?(aq) + Zn(s) — Zn*?(аq) + Сu(s)

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Step 2

Calculation for number of moles of Cu:

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mass number of moles molar mass 2.63 g number of moles 63.546 g/mol number ofmoles = 0.04139 moles

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Step 3

Calculation for mass of Zn:

From the chemical reaction it is evident 1 mol Zn is needed to rege...

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mass number of moles molar mass mass number of moles x molar mass 0.04139mol x 65.38 g/mol mass mass 2.706 g

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