In the Born-Haber cycle for aluminium oxide shown, the enthalpy change $\Delta H_6 = -15300.1\ kJ\,mol^{-1}$ is

Athe lattice enthalpy of

Al_2O_3

Bthe first electron affinity of oxygen

Cthe enthalpy change of atomisation of aluminium

Dthe enthalpy change of formation of

Al_2O_3

Explanation

It is the strongly exothermic step in which gaseous

Al^{3+}

and

O^{2-}

ions come together to form the solid lattice.

Derived from ZIMSEC Chemistry Paper 2, November 2002, Q1

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