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2K(s) + 1/2O 2 (g)

2K + (g) + O -2 (g). ∆H elect affin2 O -. 2K + (g) + e- + O(g). ∆H elect affin1 O. 2 ∆H ion K. 2K(g) + O(g). 2K + (g) + O - (g). ½ ∆H bond diss O 2. 2K(g) + 1/2O 2 (g). ∆H lattice K 2 O. 2 ∆H sub K. 2K(s) + 1/2O 2 (g). ∆H f K 2 O. K 2 O(s).

herrod-horne
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2K(s) + 1/2O 2 (g)

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  1. 2K+(g) + O-2(g) ∆Helect affin2 O- 2K+(g) + e- + O(g) ∆Helect affin1 O 2 ∆Hion K 2K(g) + O(g) 2K+(g) + O-(g) ½ ∆Hbond diss O2 2K(g) + 1/2O2(g) ∆Hlattice K2O 2 ∆Hsub K 2K(s) + 1/2O2(g) ∆Hf K2O K2O(s)

  2. ∆Hf K2O= 2∆sub K + ½ ∆HdissO2 + ∆Haffin-1O + 2∆ion K + ∆Haffin-2O- + ∆HlattK20 -363.2kJ = 2(89.99)kJ +1/2(495) + (-141) +2(419)kJ + (X) + (-2238)kJ X = + 750 kJ

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