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The standard enthalpies of formation of ...

The standard enthalpies of formation of `Al_(2) O_(3)` and CaO are - 1675 kJ `m o l^(-1)` and `- 635 kJ m o l^(-1)` respectively
For the reaction
`3CaO + 2Al rarr 3Ca + Al_(2) O_(3)` the standard reaction enthalpy `Delta_(r) H^(0) = "__________________"kJ`. ( Round off to the Nearest Integer ).

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