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IE1 and IE2 of Mg are 178 and 348 kcal ...

`IE_1` and `IE_2` of Mg are 178 and 348 kcal `"mole"^(–1)` . The energy required for the reaction, `Mg to Mg^(2+)` is:

A

`+170` kcal

B

`+526` kcal

C

`-170` kcal

D

`-526` kcal

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