Identify the $INVALID$ equation.
- A$\Delta H = \sum H_{\text{products}} - \sum H_{\text{reactants}}$
- B$\Delta H = \Delta U + P \Delta V$
- C$\Delta H^o_{\text{reaction}} = \sum H^o_{\text{product bonds}} - \sum H^o_{\text{reactant bonds}}$
- D$\Delta H = \Delta U + \Delta n RT$
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Calculate the bond enthalpy of the $H-Cl$ bond from the following reaction:
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$H_{2(g)} + Cl_{2(g)} \rightarrow 2 HCl_{(g)}$,$\Delta_{r} H^{\circ} = -185 \ kJ \ mol^{-1}$
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