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The value of the second ionisation energy of calcium is 1150 kJ mol⁻¹ - CIE - A-Level Chemistry - Question 3 - 2012 - Paper 1
Question 3
The value of the second ionisation energy of calcium is 1150 kJ mol⁻¹. Which equation correctly represents this statement? A Ca(g) → Ca²⁺(g) + 2e⁻; ΔH⁰ = +1150 kJ m... show full transcript
Worked Solution & Example Answer:The value of the second ionisation energy of calcium is 1150 kJ mol⁻¹ - CIE - A-Level Chemistry - Question 3 - 2012 - Paper 1
Step 1
Which equation correctly represents this statement?
Answer
The second ionisation energy refers to the energy required to remove an electron from a cation. The correct expression must show the ionization of a calcium cation (Ca²⁺) to form Ca³⁺ while releasing energy due to the removal of an electron.
Thus, the correct equation is:
B Ca(g) → Ca²⁺(g) + e⁻; ΔH⁰ = +1150 kJ mol⁻¹
This indicates that energy is absorbed when the electron is removed, signifying the ionisation energy.