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The following two reaction are known :- ...

The following two reaction are known :-
`N_(2(g))+O_(2(g))hArr2NO_((g)),DeltaH=-27.1KJ`
`2N_(2(g))+O_(2(g))hArr2NO_(2(g)),DeltaH=-53.5KJ`
Calculate the enthalpy change for the reaction
`NO_(2(g))hArr(1)/(2)N_(2(g))+O_(2(g))`

A

`-40.3KJ`

B

`+80.6KJ`

C

`+40.3KJ`

D

`-80.6KJ`

Text Solution

Verified by Experts

The correct Answer is:
C
`(3)=-(1)/(2)xx(1)-(1)/(2)xx(2)`
`=-(1)/(2)xx(-27.1)-(1)/(2)(-53.5)`
`DeltaH.=+40.3KJ`
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