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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

`+ 6.2 kJ `

Text Solution

Verified by Experts

The correct Answer is:
D
Given `: Fe_(2)O_(3)+3COrarr 2Fe+3CO_(2), DeltaH= -26.8 kJ` …..(i)
`FeO+ CO rarr Fe+CO_(2), DeltaH= - 16.5 kJ ` ….(ii) ,brgt Aim `: Fe_(2)O_(3) +Corarr 2FeO+CO_(2), DeltaH= ?`
Eqn. (i) `- 2 xx` Eqn. (ii) gives the required equation with
`DeltaH = - 26.8 -29 -16.5) =-26.8 +33 =6.2kJ`
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