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Solved: Using Standard Reduction Potentials to Calculate

Chemistry: The Central Science | 13th Edition | ISBN: 9780321910417 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus ISBN: 9780321910417 77

Solution for problem 2PE Chapter 20.10SE

Chemistry: The Central Science | 13th Edition

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Chemistry: The Central Science | 13th Edition | ISBN: 9780321910417 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus

Chemistry: The Central Science | 13th Edition

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Problem 2PE

Using Standard Reduction Potentials to Calculate ΔG° and K

(a) Use the standard reduction potentials in Table to calculate the standard free-energy change, ΔG° and the equilibrium constant, K, at 298 K for the reaction

Standard Reduction Potentials in Water at 25 °c

E°red(V)

Reduction Half-Reaction

+2.87

F2(g) + 2 e- → 2F-(aq)

+1.51

MnO4 –(aq) + 8 H+(aq) + 5 e–→.Mn2+(aq) + 4 H2O(l)

+1.36

Cl2(g) + 2 e–.→2 Cl–(aq)

+1.33

Cr2O7 2-(aq) + 14 H+(aq) + 6 e-.→2 Cr3+(aq) + 7 H2O(l)

+1.23

O2(g) + 4 H+(aq) + 4 e–→2 H2O(l)

+1.06

Br2(l) + 2 e–.→2 Br–(aq)

+0.96

NO3 –(aq) + 4 H+(aq) + 3 e–→NO(g) + 2 H2O(l)

+0.80

Ag+(aq) + e–→Ag(s)

+0.77

Fe3+(aq)+ e–→Fe2+(aq)

+0.68

O2(g) + 2 H+(aq) + 2 e–→H2O2(aq)

+0.59

MnO4 –(aq) + 2 H2O(l) + 3 e–→MnO2(s) + 4 OH–(aq)

+0.54

l2(s) + 2 e–.→2 l–(aq)

+0.40

O2(g) + 2 H2O(l)+ 4 e–→4 OH–(aq)

+0.34

Cu2+(aq) + 2 e–.→Cu(s)

0 [defined]

2 H+(aq) + 2 e–→H2(g)

-0.28

Ni2+(aq) + 2 e–→Ni(s)

-0.44

Fe2+ (aq) + 2 e–Fe(s)

-0.76

Zn2+(aq) + 2 e–Zn(s)

-0.83

2 H2O(l) + 2 e–→H2(g) + 2 OH–(aq)

-1.66

Al3+(aq) + 3 e–→Al(s)

-2.71

Na+(aq) + e–→Na(s)

-3.05

Li+(aq)+ e–→Li(s)

4 Ag(s) + O2(g) + 4 H+(aq) → 4 Ag+(aq) + 2 H2O(l)

(b) Suppose the reaction in part (a) is written

2 Ag(s) +½O2(g) + 2 H+(aq)→ 2 Ag+(aq) + H2O(l)

What are the values of E° ΔG° and K when the reaction is written in this way?

Consider the reaction 2 Ag+(aq) + H2(g)→ 2 Ag(s) + 2 H+(aq). Calculate ΔG°f for the Ag+(aq) ion from the standard reduction potentials in Table 20.1 and the fact that ΔG°f for H2(g), Ag(s), and H+(aq) are all zero. Compare your answer with the value given in Appendix C.

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Chapter 20.10SE, Problem 2PE is Solved
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Textbook: Chemistry: The Central Science
Edition: 13
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus
ISBN: 9780321910417

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Solved: Using Standard Reduction Potentials to Calculate