Let's sum up
1/2O2+O+1e+O-+1e+Mg+Mg1++Mg2++O2-=O+1e+O-+1e+Mg+Mg1++Mg2++O2--1803kJ
1/2 O2+Mg=MgO -1803kJ
∆H(MgO) =1803 kJ
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