Given that the standard enthalpy [EN-thal-pee] of formation for solid calcium carbonate is -1200 kilojoules per mole, for solid calcium oxide is -600 kilojoules per mole, and for gaseous carbon dioxide is -400 kilojoules per mole, which of the following is the standard enthalpy change in kilojoules per mole for the reaction: CaCO3 (s) -> [yields] CaO (s) + CO2 (g)?