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Which ions are present in MgO(s) Calcula...

Which ions are present in MgO(s) Calculate the enthalpy change for the reaction `Mg(s) + 1//2O_(2)(g) rarr MgO(s)`
What kind of enthalpy change is this? Standard enthalpy of formation of MgO.
`DeltaH_(atom(O))= +249 kJ mol^(-1) " " DeltaH_(atom(Mg))=+148 kJ mol^(-1)`
`DeltaH_("1st ionisation energy" (Mg))=+738 KJ mol^(-1) " " DeltaH_(2nd "electron energy "(Mg))= +145 1 kJ mol^(-1)`
`DeltaH _("1st electron affinity "(O))= -141 kJ mol^(-1) " " DeltaH_(2nd " electron affinity "(O)) =+798 kJ mol^(-1)`
`DeltaH_("lattice energy "(MgO))= - 3791 kJ mol^(-1)`

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Ionic bond : -548 kJ/mol
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