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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

`+6.2kJ`

B

`+10.3kJ`

C

`-43.3kJ`

D

`-10.3kJ`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) `Fe_(2)O_(3)(s)+3CO(g)to2Fe(s)+3CO_(2)(g),DeltaH=-26.8kJ` . . .(i)
`FeO(s)+CO(g) to Fe(s)+CO_(2)(g),DeltaH=-16.5kJ` . . . (ii) ltbr. Eq. `(i)-2xxeq.(ii)`, we get
`Fe_(2)O_(3)(s)+CO(g)to2FeO(s)+CO_(2)(g)`
`DeltaH=-26.8+33.0=+6.2kJ`
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