Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter17: Electrochemistry
Section: Chapter Questions
Problem 74QAP: Consider the reaction low at 25°C: 3SO42(aq)+12H+(aq)+2Cr(s)3SO2(g)+2Cr3+(aq)+6H2O Use Table 17.1 to...
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![5a) A certain reaction is completed 20% in 12.6 min at 300 K and in 3.20 min at 340 K.
Calculate its activation energy.
5b) Oxidation of lactate to pyruvate by cytochrome C (representing as cytochrome C(Fe*))
is an important biolagical reaction. The followings are reduction reactions and the relevant
standart reduction potentials (E°) at pH = 7 and 25°C.
Pyruvate + 2H* + 2e' → Lactate
E° = -0,185 V
Cytochrome C (Fe**) + e¯ → Cytochrome C (Fe2*)
E° = 0.254 V
i) Write anodic, cathodic and total reactions.
ii) Using the Gibss free energy and Nernst equations calculate the following equilibrium
ratio (K) at pH=7 and 25°C;
[Cytochrome C(Fe²+)]²[Pyruvate][H*]²
[Cytochrome C(Fe3+)]²[Lactate¬]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd0460971-47dd-4422-a238-68beeae0868c%2F350e035e-6a1d-4901-ac07-9476f1c18835%2Fz2srbmd_processed.png&w=3840&q=75)
Transcribed Image Text:5a) A certain reaction is completed 20% in 12.6 min at 300 K and in 3.20 min at 340 K.
Calculate its activation energy.
5b) Oxidation of lactate to pyruvate by cytochrome C (representing as cytochrome C(Fe*))
is an important biolagical reaction. The followings are reduction reactions and the relevant
standart reduction potentials (E°) at pH = 7 and 25°C.
Pyruvate + 2H* + 2e' → Lactate
E° = -0,185 V
Cytochrome C (Fe**) + e¯ → Cytochrome C (Fe2*)
E° = 0.254 V
i) Write anodic, cathodic and total reactions.
ii) Using the Gibss free energy and Nernst equations calculate the following equilibrium
ratio (K) at pH=7 and 25°C;
[Cytochrome C(Fe²+)]²[Pyruvate][H*]²
[Cytochrome C(Fe3+)]²[Lactate¬]
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