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Heat of Formation

What is the e...

Question

What is the enthalpy change for the given reaction, if enthalpies of formation of $A I_{2} O_{3}$ and $F e_{2} O_{3}$ are -1670 kJ $m o l^{- 1}$ and -834 kJ $m o l^{- 1}$ respectively.
$F e_{2} O_{3} + 2 A I \to A I_{2} O_{3} + 2 F e$

A

- 836 k J m o l^{- 1}

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B

+ 836 k J m o l^{- 1}

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C

- 424 k J m o l^{- 1}

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D

+ 424 k J m o l^{- 1}

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Solution

The correct option is C $- 836 k J m o l^{- 1}$
$Δ H = \sum Δ H_{P} - \sum Δ H_{R}$ = -1670 - (-834) = -836 kJ $m o l^{- 1}$

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