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    I'm confused on how they got the value for Cl-Cl to be 242?
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    There is information missing.

    Cl-Cl and H-Cl are not shown in the Q.
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    (Original post by Tom67097)
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    I'm confused on how they got the value for Cl-Cl to be 242?
    There's missing information, unless the exam board want you to know a few bond disassociation enthalpies but i doubt that. There's no physical way to work out cl-cl enthalpy with that information. so don't worry.
 
 
 
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