Q.The bond enthalpy of $H-H$ , $Cl-Cl$ , and $H-Cl$ are $434, 242$ and $431 \text{ kJ/mol}$ respectively. Enthalpy of the reaction $H_2 + Cl_2 → 2HCl$ is:

-186 \text{ kJ}

+186 \text{ kJ}

-93 \text{ kJ}

+93 \text{ kJ}

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Q.The bond enthalpy of H−HH-HH−H, Cl−ClCl-ClCl−Cl, and H−ClH-ClH−Cl are 434,242434, 242434,242 and 431 kJ/mol431 \text{ kJ/mol}431 kJ/mol respectively. Enthalpy of the reaction H2+Cl2→2HClH_2 + Cl_2 → 2HClH2​+Cl2​→2HCl is: