osaka Posted April 19, 2004 Share Posted April 19, 2004 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 ? Link to comment Share on other sites More sharing options...
chemistry Posted April 19, 2004 Share Posted April 19, 2004 The electron affinity for adding the second electron is almost always positive; while the first electron affinity is negative. Link to comment Share on other sites More sharing options...
osaka Posted April 20, 2004 Author Share Posted April 20, 2004 eeyana how can this happen? Link to comment Share on other sites More sharing options...
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