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Calculate change in enthalpy for the rea...

Calculate change in enthalpy for the reaction at `27^(@)C`
`H_(2)(g)+Cl_(2)(g)rarr2H-Cl(g)`
by using the bond energy and energy data
Bond energies of `H-H,Cl-Cl` and `H-Cl` bonds are `435 kJ mol^(_1), 240 kJ mol^(-1)` and `430 kJmol^(-1)` respectively.

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The correct Answer is:
`-185 kJ`
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