
Use your knowledge of thermochemistry to calculate the ΔH for the following processes: (a) Cl−(g) → Cl+(g) + 2e−; (b) K+(g) + 2e− → K−(g).
(a)

Interpretation: The value of
Concept Introduction:
Second ionization energy: The minimum energy needed to remove an electron from a unipositive gaseous ion to form a dipositive ion in the ground state is known as second ionization energy.
Electron Affinity: It is energy change taking place when one electron is added to an atom which is neutral in its gaseous state forming an anion.
Answer to Problem 8.141QP
The value of
Explanation of Solution
The reaction is given below:
Here, one electron is removed from
Hence the change in energy for the given reaction is the sum of first ionization energy of
Therefore,
The
The value of
(b)

Interpretation: The value of
Concept Introduction:
Second ionization energy: The minimum energy needed to remove an electron from a unipositive gaseous ion to form a dipositive ion in the ground state is known as second ionization energy.
Electron Affinity: It is energy change taking place when one electron is added to an atom which is neutral in its gaseous state forming an anion.
Answer to Problem 8.141QP
The value of
Explanation of Solution
The reaction is given below:
Here, one electron is added to
Hence the change in energy for the given reaction is the sum of the electron affinity of
Therefore,
The
The value of
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