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Formation of ammonia is shown by the rea...

Formation of ammonia is shown by the reaction,
`N_(2(g))+3H_(2(g)) rarr 2NH_(3(g)), Delta_(f)H^(@)=-"91.8 kJ mol"^(-1)`
What will be the enthalpy of reaction for the decomposition of `NH_(3)` according to the reaction ?
`2NH_(3(g)) rarr N_(2(g))+3H_(2(g)), Delta_(r)H^(@)=`

A

`-"91.8 kJ mol"^(-1)`

B

`+"91.8 kJ mol"^(-1)`

C

`-"45.9 kJ mol"^(-1)`

D

`+"45.9 kJ mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
The sign of `DeltaH` is reversed.
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