Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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Transcribed Image Text: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
1. 3Cu(s) + 2NO, + 8H* → 3Cu²* (aq) + 4H2O+ 2NO
2. Cu (aq) + 20Н (аq) —> Сu(ОН),(s)
3. Cu(OH),(s) –→ CuO(s) + H2O
4. CuO(s) + 2H → Cu²* (aq) + H2O
5. Cu* (aq) + Zn(s) → Zn²*(aq) + Cu(s)
2+
2+
2+
cycle reactions.
amount of reagents, present answers to the following questions.
Assume that you wa
carry out a sequence
ord
use the right
Question 1
Question 2
Question 3
How many grams of zinc metal are needed to completely regenerate 1.19 g of
copper in the fifth step in the cycle?
By how much is zinc oxidized in the fifth reaction?
Transcribed Image Text: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(I) 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
1. 3Cu(s) + 2NO3 + 8H* → 3Cu²+ (aq) + 4H2O+ 2NO
2. Cu?* (aq) + 20H (aq) → Cu(OH),(s)
3. Cu(OH),(s) → CuO(s) + H2O
4. CuO(s) + 2H → Cu²* (aq) + H2O
5. Cu** (aq) + Zn(s) → Zn²+(aq) + Cu(s)
2+
Assume that you want to carry out a sequence of cycle reactions. In order to use the right
amount of reagents, present answers to the following questions.
Question 1
Question 2
How many grams of copper(II) oxide will form from 12.0 mmol of copper(II)
hydroxide when the third step of the cycle goes to completion?
What volume of 6.0M H2SO4 is required to completely convert all obtained copper(II)
oxide to copper(II) cation in the fourth step of the cycle?
mL
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