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    Hess' Law

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    Calculate the enthalpy change for this reaction, using the following combustion data:

    C2H4(g) + 3 O2(g) yields 2CO2(g)+ 2H2O(l)
    deltaH= -1401 kj

    C2H6(g) + 7/2 O2(g) yields 2CO2(g) + 3H2O(l)
    deltaH= -1550kj

    H2(g) + 1/2 O2(g) yields H2O(l)
    deltaH= -286kj.

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    Solution Summary

    The solution is given in an attachment with step-by-step equations and a short description regarding Hess' Law.