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The following two reactionas are known ...

The following two reactionas are known
`FeO_(3)(s)+3CO(g)rarr2Fe(s)+CO_(2)(g)` :
`DeltaH=-26.8KJ`
`FeO(s)+CO(g)rarrFe(s)+CO_(2)(g):DeltaH=-16.5KJ`
The value of `DeltaH` for the following reaction
`Fe_(2)O_(3)(s)+CO(g)rarr2FeO_(2)(s)+CO_(2)(g)` is

A

`+10.3KJ`

B

`-43.3KJ`

C

`-10.3KJ`

D

`6.2KJ`

Text Solution

Verified by Experts

The correct Answer is:
C
Given
`Fe_(2)O_(3)rarr2Fe+3CO_(2)` ,
`DeltaH=-26.8KJ` (i)
`FeO+COrarrFe+CO_(2)` ,
`DeltaH=-16.5KJ` (ii) Aim, `Fe_(2)O+COrarr2FeO+CO_(2),DeltaH`=?
eq. (i) `-2xxeq` (ii) gives the reuired eq. With,
`DeltaH =-26.8 -2(-16.5)=-26.8 + 33 =6.2` KJ
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