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The following two reactions are known: ...

The following two reactions are known:
`Fe_(2)O_(3)(s)+3CO(g)to 2Fe(s)+3CO_(2)(g),DeltaH=-26.8kJ`
`FeO(s)+CO(g) to Fe(s)+CO_(2)(g),DeltaH=-16.5kJ`
The value of `DeltaH` for the following reaction
`Fe_(2)O_(3)+CO(g) to 2FeO(s)+CO_(2)(g)` is

A

`+ 10.3` kJ

B

`- 43.3` kJ

C

`- 10.3` kJ

D

`+ 6.2` kJ

Text Solution

Verified by Experts

The correct Answer is:
D
`Fe_(2)O_(3)(s) + 3CO(g) rarr 2Fe(s) + 3CO_(2)(g), Delta H_(1)= -26.8`kJ...(i)
`FeO(s) + CO(g) rarr Fe(s) + CO_(2)(g), Delta H_(2)= -16.5`kJ...(ii)
`Delta H_(r)= Delta H_(1)- 2Delta H_(2)`
`=-26.8- 2(-16.5)= +6.2kJ`
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