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The bond energies of H--H , Br--Br and H...

The bond energies of `H--H` , `Br--Br` and `H--Br` are `433,, 192` and `364KJmol^(-1)` respectively. The `DeltaH^(@)` for the reaction
`H_(2)(g)+Br_(2)(g)rarr2HBr(g)` is

A

`-261 KJ`

B

`+103 KJ`

C

`+261 KJ`

D

`-103 KJ`

Text Solution

Verified by Experts

The correct Answer is:
D
For reaction ,
`H_(2)(g) + Br_(2)(g) to 2HBr(g) DeltaH^(@)=?`
`DeltaH^(@) =- [(2xx` bond energy of HBr )-(bond energy of `H_(2) + ` bond energy of `Cl_(2))]`
`DeltaH^(@)=-[2xx(364)-(433+ 192)]KJ`
`=-[728-(625)] KJ =-103 KJ`
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