The `H-H` bond energy is `430KJ mol^(-1)` and `Cl-Cl` bonds is 240KJ `mol^(-1)`. DeltaH` for HCl is `-90KJ` . The `H-Cl` bond energy is about.

Options

A. `425KJmol^(-1)`
B. `KJmol^(-1)`
C. `360mol^(-1)`
D. `180mol^(-1)`

Answer

A

Explanation

`(1)/(2)H_(2)+(1)/(2)Cl_(2)rarrHCl
DeltaH=-90KJ`
`:. DeltaH=(1)/(2)E_(H-H)+(1)/(2)E_(Cl-Cl)`
or `-90=(1)/(2)xx430+(1)/(2)xx240-epsilon_(H-Cl)`
`:. E_(H-Cl)=425KJmol^(-1)`