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What is the enthalpy change for the give...

What is the enthalpy change for the given reaction, if enthalpies of formation of `Al_(2)O_(3)` and `Fe_(2)O_(3)` are `-"1670 kJ mol"^(-1) and -"834 kJ mol"^(-1)` respectively?
`Fe_(2)O_(3) +2Al rarr Al_(2)O_(3)+2Fe`

A

`-"836 kJ mol"^(-1)`

B

`+"836 kJ mol"^(-1)`

C

`-"424 kJ mol"^(-1)`

D

`+"424 kJ mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaH=SigmaDeltaH_(p)-SigmaDeltaH_(R)`
`=-1670-(-834)=-"836 kJ mol"^(-1)`
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