General Chemistry II-Lecture,Section-1-Spring 2025

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Refer to the galvanic cell below (the contents of each half-cell are written beneath each compartment).

The standard reduction potentials are as follows:

MnO4- + 8H+ + 5e- ® Mn2+ + 4H2O	E° = 1.51 V
Cr2O72- +14H+ + 6e- ® 2Cr3+ +7H2O	E° = 1.33 V

What is the value of

E°_cell?

2.84 V

0%

0.18 V

0%

1.79 V

0%

2.29 V

0%

-0.18 V

0%

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Consider the hydrogen-oxygen fuel cell where

          H₂(g) + O₂(g) H₂O(l)      DG° = -237.18 kJ/mol H2

Which of the following statements is(are) true?

I.	At standard conditions, the maximum work the fuel cell could do on the surroundings is 237.18 kJ/mol.
II.	In the real world, the actual amount of useful work the cell can do is less than 237.18 kJ.
III.	More energy is dissipated as waste heat in the fuel cell than in the reversible pathway.

II

0%

III

0%

I, II, and III

0%

None of the statements is true.

0%

I

0%

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Refer to the galvanic cell below (the contents of each half-cell are written beneath each compartment).

The standard reduction potentials are as follows:

MnO4- + 8H+ + 5e- ® Mn2+ + 4H2O	E° = 1.51 V
Cr2O72- +14H+ + 6e- ® 2 Cr3+ +7H2O	E° = 1.33 V

What is the oxidation state of Cr in Cr₂O₇^2-?

-1

0%

+12

0%

+6

0%

+7

0%

-2

0%

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Calculate E at 25°C for this cell, given the following data:

          Ag⁺ + e^- ® Ag(s) E° = 0.80 V

          Ni²⁺ + 2e^- ® Ni(s) E° = -0.23 V

          K_sp for AgCl = 1.6 ´ 10^-10

1.01 V

0%

0.83 V

0%

0.54 V

0%

2.98 V

0%

This cannot be determined from the data given

0%

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