General Chemistry Ii Jasperse - Electrochemistry Extra Practice Problems With Answers Page 5
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135
Cell Potentials
Eº(cell) = Eº(red) + Eº(ox)
23. What is E˚ for the following balanced reaction?
Eº(ox) = -Eº(red)
T
2+
2+
Zn(s) + Pb
(aq) → Zn
(aq) + Pb(s)
Half-reaction
Standard Reduction Potential
2+
–
Zn
(aq) + 2e
→ Zn(s)
–0.763
2+
–
Pb
(aq) + 2e
→ Pb(s)
–0.126
a.
+0.637 V
d.
–0.889 V
b.
–0.637 V
e.
+0.889 V
c.
+1.274 V
24. What is E˚ for the following balanced reaction?
3+
3+
Al(s) + Fe
(aq) → Al
(aq) + Fe(s)
Half-reaction
Standard Reduction Potential
3+
–
Fe
(aq) + 2e
→ Fe(s)
+0.771
3+
–
Al
(aq) + 2e
→ Al(s)
–1.660
a.
+1.280 V
d.
–0.889 V
b.
–2.431 V
e.
+0.889 V
c.
+2.431 V
T
25. What is E˚ for the following balanced reaction?
+
-
3+
4H
(aq) + Fe(s) + NO
(aq) → Fe
(aq) + NO(aq) + 2H
O(l)
3
2
Standard Reduction Potential
–
+
–
E˚ = +0.960 V
NO
+ 4H
+ 3e
→ NO + 2H
O
3
2
3+
–
E˚ = +0.771 V
Fe
+ 3e
→ Fe
a.
+0.189 V
d.
–1.731 V
b.
–0.189 V
e.
None of the above
c.
+1.731 V
+
26. Given the electrochemical reaction shown, if the standard reduction potential of Ag
! Ag is +0.80 V, and the
2+
! Cu is +0.34V, what is E˚ for the following?
standard reduction potential of Cu
2+
+
Cu / Cu
(aq) // Ag
(aq) / A
E˚ = ??? V
a. +1.26 V
b. +0.85 V
c. +0.46 V
T
d. -0.37 V
e. none of the above
+2
27. Given the electrochemical reaction shown, if the standard reduction potential of Ni
! Ni is -0.26 V, and the
3+
standard reduction potential of Al
! Al is -1.66V, what is E˚ for the following?
3+
+2
Al / Al
(aq) // Ni
(aq) / Ni
E˚ = ??? V
a. +1.26 V
b. +0.85 V
c. +0.46 V
d. +1.40 V
e. none of the above
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