The standard enthalpies of formation of Al₂O₃ and CaO are $-$1675 kJ mol^-1 and $-$635 kJ mol^$-$1 respectively.

For the reaction

3CaO + 2Al $\to$ 3Ca + Al₂O₃ the standard reaction enthalpy $\Delta$_rH⁰ = _________ kJ.

(Round off to the Nearest Integer)