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If bond enthalpies Of N-=N,H-Hand N-H bo...

If bond enthalpies Of `N-=N,H-Hand N-H` bonds are `x_(1),x_(2)and x_(3)` respectively ,`DeltaH_(f)^(@)`for `NH_(3)` will be :

A

`x_(1)+3x_(2)-6x_(3)`

B

`(1)/(2)x_(1)+(3)/(2)x_(2)-3x_(3)`

C

`3x_(3)-(1)/(2)x_(1)+(3)/(2)x_(2)`

D

`6x_(3)-x_(1)-3x_(2)`

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The correct Answer is:
b
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