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Standard XII

Chemistry

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.
$F e_{2} O_{3} + 2 A I \to A I_{2} O_{3} + 2 F e$

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

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

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

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+ 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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What is the enthalpy change for the given reaction, if enthalpies of formation of AI2O3 and Fe2O3 are -1670 kJmol−1 and -834 kJ mol−1 respectively. Fe2O3+2AI→AI2O3+2Fe

The correct option is C −836kJmol−1ΔH=∑ΔHP−∑ΔHR = -1670 - (-834) = -836 kJ mol−1

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.
$F e_{2} O_{3} + 2 A I \to A I_{2} O_{3} + 2 F e$

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 $m o l^{- 1}$