The enthalpies of formation of Al2O3 and Cr2O3 are -1596 kJ and -1134 kJ respectively- - H for the reaction- 2Al - Cr2O3- 2Cr - Al2O3 is -

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Hess' Law

The enthalpie...

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The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are -1596 kJ and -1134 kJ respectively. $Δ H$ for the reaction,
$2 A l + C r_{2} O_{3} \to 2 C r + A l_{2} O_{3}$ is :

-2730 kJ

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-462 kJ

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-1365 kJ

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+2730 kJ

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The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction

$2 A l + C r_{2} O_{3} \to 2 C r + A l_{2} O_{3}$ is

The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction

$2 A l + C r_{2} O_{3} \to 2 C r + A l_{2} O_{3}$ is

C r_{2} O_{3}

A l_{2} O_{3}

Δ_{f} G^{o}

^{- 1}

^{- 1}

C r_{2} O_{3}

Δ H_{f}^{\circ}

F e_{2} O_{3}

A l_{2} O_{3}

2 A l + F e_{2} O_{3} ⟶ A l_{2} O_{3} + 2 F e

Δ H

8 A l (s) + 3 F e_{3} O_{4} (s) \to 4 A l_{2} O_{3} (s) + 9 F e (s)

Δ H_{f}

A l_{2} O_{3} (s)

F e_{3} O_{4} (s)

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