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AFMC AFMC Solved Paper-2000

  • question_answer
    \[{{H}_{2}}+C{{l}_{2}}\xrightarrow{{}}2HCl,\Delta H=-194\,kJ\]In the above reaction the heat of formation of \[HCl\]is:

    A) + 97 kJ                                  

    B) - 97 kJ

    C) + 107 kJ                               

    D) - 107 kJ

    Correct Answer: B

    Solution :

    Heat of formation is the amount of heat absorbed or liberated when one mole of a substance is formed from its constituent element. When 2 moles of HCl is formed heat liberated = 194 kJ \[\therefore \]When 1 mol of HCl is formed heat liberated \[=\frac{194}{2}=97\,kJ\] \[\therefore \]                  \[\Delta {{H}_{f}}=-97\,kJ\]


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