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Heat evolved in the reaction H(2)[g]+C...

Heat evolved in the reaction
`H_(2)[g]+Cl_(2)[g] rarr 2HCl[g]` is 182 kJ Bond energies H- H = 430 kJ/mole, `Cl-Cl = 242kJ//"mole"`. The H-Cl bond energy is

A

`245 "KJ mol"^(-1)`

B

`427 "KJ mol"^(-1)`

C

`336 "KJ mol"^(-1)`

D

`154 "KJ mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`H_(2)+Cl_(2)rarr 2HCl , Delta H = -182 kJ`
`Delta H=Sigma(B.E.)_(R )-Sigma (B.E.)_(P)-182 =(430+242)-2xx(B.E.)_(H-Cl)`
`therefore (B.E.)_(H-Cl)=427 KJ mol^(-1)`
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ALLEN-THERMODYNAMICS -EXERCISE -3
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