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    Heat of Formation

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    Methylene chloride can be prepared from the reaction of methane and chlorine, by the following equation:
    CH4(g) + Cl2(g) ---> CH2Cl2(g) + HCl(g)
    Calculate the standard heat of formation in kilojoules for the reaction using the following measured heats of formation.
    HCl(g) + CH3Cl(g) --> CH4(g) + Cl2(g) Delta H = +98.3 kJ
    CH3Cl(g)+ Cl2(g) --> CH2Cl2(g) + HCl(g) Delta H = -104kJ

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    Solution Preview

    First balance the equation:
    CH4(g) + Cl2(g) ---> CH2Cl2(g) + HCl(g)
    CH4(g) + 2Cl2(g) ---> CH2Cl2(g) + 2HCl(g)
    Now rewrite
    HCl(g) + CH3Cl(g) --> CH4(g) + ...

    Solution Summary

    The solution provides a detailed calculation of the heat of formation (which includes balancing equations).