Concept explainers
For each of the following reactions, determine the overall balanced
(a)
(b)
(c)
(d)
(a)
Interpretation:
The overall balanced electrochemical reaction and the values of
Concept introduction:
Standard Gibbs free energy of a reaction is used check whether the reaction is spontaneous or not. If the value of
Answer to Problem 8.10E
The overall balanced electrochemical reaction is as follows,
The value of
Explanation of Solution
The given reaction is represented as,
From Table
The number of moles of electrons transferred in the above reaction is
The number of moles of electrons transferred in both reactions is equal. Therefore, the given reaction is a balanced electrochemical reaction.
From Table
The above equation is reversed and the value of
The number of moles of electrons transferred in the above reaction is
The relation between standard Gibbs free energy and standard electrical potential is represented as,
Where,
•
•
•
•
Substitute the values of the standard reduction potential of
The value
Substitute the values of the standard oxidation potential of
The value
The value of
Where,
•
•
Substitute the value of
Therefore, the value
The number of electrons transferred in the overall reaction is
Rearrange the equation (3) for the value of
Substitute the values of
The value of
The overall balanced electrochemical reaction is as follows,
The value of
(b)
Interpretation:
The overall balanced electrochemical reaction and the values of
Concept introduction:
Standard Gibbs free energy of a reaction is used check whether the reaction is spontaneous or not. If the value of
Answer to Problem 8.10E
The overall balanced electrochemical reaction is as follows,
The value of
Explanation of Solution
The given reaction is represented as,
From Table
The above equation is reversed and the value of
The number of moles of electrons transferred in the above reaction is
From Table
The number of moles of electrons transferred in the above reaction is
The number of moles of electrons transferred in both reactions is equal. Therefore, the given reaction is balanced electrochemical reaction.
The relation between standard Gibbs free energy and standard electrical potential is represented as,
Where,
•
•
•
•
Substitute the values of the standard oxidation potential of
The value
Substitute the values of the standard reduction potential of
The value
The value of
Where,
•
•
Substitute the value of
Therefore, the value
The number of electrons transfer in the overall reaction is
Rearrange the equation (3) for the value of
Substitute the values of
The value of
The overall balanced electrochemical reaction is as follows,
The value of
(c)
Interpretation:
The overall balanced electrochemical reaction and the values of
Concept introduction:
Standard Gibbs free energy of a reaction is used check whether the reaction is spontaneous or not. If the value of
Answer to Problem 8.10E
The overall balanced electrochemical reaction is as follows,
The value of
Explanation of Solution
The given reaction is represented as,
From Table
The above equation is reversed and the value of
The number of moles of electrons transferred in the above reaction is
From Table
The number of moles of electrons transferred in the above reaction is
The relation between standard Gibbs free energy and standard electrical potential is represented as,
Where,
•
•
•
•
Substitute the values of the standard oxidation potential of
The value
Substitute the values of the standard reduction potential of
The value
The balanced overall electron chemical reaction is obtained by multiplying chemical equation (7) by
Therefore, the value
The number of electrons transferred in the overall reaction is
Rearrange the equation (3) for the value of
Substitute the values of
The value of
The overall balanced electrochemical reaction is as follows,
The value of
(d)
Interpretation:
The overall balanced electrochemical reaction and the values of
Concept introduction:
Standard Gibbs free energy of a reaction is used check whether the reaction is spontaneous or not. If the value of
Answer to Problem 8.10E
The overall balanced electrochemical reaction is as follows,
The value of
Explanation of Solution
The given reaction is represented as,
From Table
The number of moles of electrons transfer in the above reaction is
From Table
The number of moles of electrons transferred in the above reaction is
The number of moles of electrons transferred in both reactions is equal. Therefore, the given reaction is balanced electrochemical reaction.
The relation between standard Gibbs free energy and standard electrical potential is represented as,
Where,
•
•
•
•
Substitute the values of the standard reduction potential of
The value
Substitute the values of the standard reduction potential of
The value
The value of
Where,
•
•
Substitute the value of
Therefore, the value
The number of electrons transferred in the overall reaction is
Rearrange the equation (3) for the value of
Substitute the values of
The value of
The overall balanced electrochemical reaction is as follows,
The value of
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Chapter 8 Solutions
Physical Chemistry
- For each of the reactions, calculate E from the table of standard potentials, and state whether the reaction is spontaneous as written or spontaneous in the reverse direction under standard conditions. (a) Zn(s)+Fe2+(aq)Zn2+(aq)+Fe(s) (b) AgCl(s)+Fe2+(aq)Ag(s)+Fe3+(aq)+Cl(aq) (c) Br2(l)+2Cl(aq)Cl2(g)+2Br(aq)arrow_forwardWhat is the standard cell potential you would obtain from a cell at 25C using an electrode in which I(aq) is in contact with I2(s) and an electrode in which a chromium strip dips into a solution of Cr3(aq)?arrow_forwardThe cell potential of the following cell at 25C is 0.480 V. ZnZn2+(1M)H+(testsolution)H2(1atm)Pt What is the pH of the test solution?arrow_forward
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- What is the cell potential of the following cell at 25C? Ni(s)Ni2+(1.0M)Sn2(1.5104M)Sn(s)arrow_forwardCalculate the cell potential of a cell operating with the following reaction at 25C, in which [MnO4] = 0.010 M, [Br] = 0.010 M. [Mn2] = 0.15 M, and [H] = 1.0 M. 2MNO4(aq)+10Br(aq)+16H+(aq)2MN2(aq)+5Br2(l)+8H2O(l)arrow_forwardAn electrolysis experiment is performed to determine the value of the Faraday constant (number of coulombs per mole of electrons). In this experiment, 28.8 g of gold is plated out from a AuCN solution by running an electrolytic cell for two hours with a current of 2.00 A. What is the experimental value obtained for the Faraday Constant?arrow_forward
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