IE1 and IE2 of Mg are 178 and 348kcal respectively. The energy required (in kcal) for the following reaction is: Mg→Mg2++2e−
(Where IE = ionization energy)
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Solution
According to given conditions Mg→Mg++e−IE1=178kcal Mg+→Mg2++e−IE2=348kcal
Therefore, Mg→Mg2++2e−IE=IE1+IE2
Hence, ionization energy of the given reaction is: IE=178kcal+348kcal =526kcal