For the first ionization energy of mercury is 1006 kJ/mol. The energy change for the reaction is mathematically given as
dH = 1006KJ/mol
The amount of energy required to remove an electron from a neutral atom is called ionization energy. from the question, the electron is removed from the neutral atom Hg to give the first ionization energy
Hg→Hg +e
therefore the energy change for the reaction is
dH = 1006KJ/mol
In conclusion, the energy change for the reaction is
dH = 1006KJ/mol
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