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CHM 101 CHM 101 Past Questions Objective Question
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Question

Calculate the electromotive force for a zinc-silver couple at 25 °C, 1 atm, and 1 M: given that E°Zn = -0.76 V and E°Ag = +0.80 V
Options
A -0.04 V
B 0.04 V
C 1.56 V
Correct Answer
D -1.56 V
Correct Answer

Option C is the correct answer.

Detailed Explanation

Zinc is more easily oxidized (more negative reduction potential) so it will be the anode. Silver is the cathode. E°cell = E°cathode - E°anode = 0.80 V - (-0.76 V) = 1.56 V.

Hint

E°cell = E°(reduction at cathode) - E°(reduction at anode). The more negative potential is oxidized.

Question Info

Course: CHM 101
Topic: CHM 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1010 of 1872
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