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The heat of formation of Fe(2)O(3(s)) is...

The heat of formation of `Fe_(2)O_(3(s))` is `-824.2 kJ mol^(-1), Delta H` for the reaction `2Fe_(2)O_(3(s)) rarr 4Fe_((s)) + 3O_(2(g))` is :

A

`-412.1 kJ`

B

`-1648.4 kJ`

C

`-3296.8 kJ`

D

`1648.4 kJ`

Text Solution

Verified by Experts

The correct Answer is:
D
Formation reaction for `Fe_(2)O_(3(s))` is
`2Fe_((s))+O_(2(g))rarrFe_(2)O_(3(s))`
`Delta H_(f)=-824.2 kJ`
The equation `2Fe_(2)O_(3(s))rarr4Fe_((s))rarr4Fe_((s))+3O_(2(g))`
is obtained by reversing formation reaction equation and multiplying by 2.
`therefore Delta H=-Delta H_(f)xx2=-(-824.2)xx2=+1648.4 kJ`
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