The standard enthalpies of formation of ${Al}_{2}{O}_{3}$ and $CaO$ are $- 1675kJ{mol}^{- 1}$ and $- 635kJ{mol}^{- 1}$ respectively.
For the reaction
$3CaO + 2Al \to 3Ca + {Al}_{2}{O}_{3}$ the standard reaction enthalpy ${\Delta}_{r}{H}^{0} =$ ________ $kJ .$
(Round off to the Nearest Integer).

Question

The standard enthalpies of formation of ${Al}_{2}{O}_{3}$ and $CaO$ are $- 1675kJ{mol}^{- 1}$ and $- 635kJ{mol}^{- 1}$ respectively.

For the reaction

$3CaO + 2Al \to 3Ca + {Al}_{2}{O}_{3}$ the standard reaction enthalpy ${\Delta}_{r}{H}^{0} =$ ________ $kJ .$

(Round off to the Nearest Integer).

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Correct answer: 0

Given reaction: 3CaO + Al → Al _ 2 O _ 3 + 3Ca Now, Δ _ r H ° = Σ Δ _ f H _ Products ^ º - Σ Δ _ f H _ Reactants ^ º = [ 1 × ( - 1675 ) + 3 × 0 ] - [ 3 × ( - 635 ) + 2 × 0 ] = + 230kJ mol ^ - 1

The standard enthalpies of formation of Al _ 2 O _ 3 and CaO are -...

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