Concept explainers
(a)
Interpretation:
A balanced equation for the cell reaction should be written.
Concept introduction:
To obtain the cell reaction, cathode reaction and the anode reaction should be added together and before that, the two half-cell reactions should be electronically equal, so that the electrons are cancelled off when adding. If common ions present they should also be deducted.
(b)
Interpretation:
Concept introduction:
The standard Gibbs free energy change can be calculated as follows:
It is related to equilibrium constant as follows:
(c)
Interpretation:
The cell voltage at 250 C when the concentration of
Concept introduction:
The Nernst equation allows to calculate cell potential at non-standard conditions.
E − non-standard cell potential
E0 − standard cell potential
n − number of electrons passed through the cell
Q − reaction quotient
(d)
Interpretation:
Number of grams of
Concept introduction:
The number of coulombs of charge passed through the cell equals the product of the current in amperes and the time in seconds.
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CHEMISTRY-TEXT
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