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Ea

osaka
in Chemistry

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i have a problem with MgO(s).

 

Mg(s) → Mg(g) Heat of sublimation = +148 kj

 

½O2(g) → O(g) Bond dissociation = +249 kj

 

Mg(g) → Mg2+(g)+ 2e- IE1+IE2= +2201 kj

 

O(g)+2e- → O2- EA= +737 kj

 

look at the EA in peiodic table O(EA= -141 kj).

When O charged 2e- it seems to be like F(EA=-328 kj) charged 1e-.

it should be - not +.

but Why EA of O=+737kj ?

The electron affinity for adding the second electron is almost always positive; while the first electron affinity is negative.

  • Author

eeyana :rolleyes: how can this happen?

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