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    Calculating Standard Enthalpy of Formation

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    Several reactions and their standard reaction enthalpies at 298.15k are given:

    CaC2(s) + 2H2O(l)--> (CaOH)2(s) + C2H2 (g)

    Ca(s) + 1/2 O2(g)--> CaO(s)
    deltaH: -635.1

    CaO(s) + H2O (l)--> Ca(OH)2 (s)
    deltaH: -65.2

    The standard enthalpies of combustion of graphite and C2H2(g) are -393.51 and -1299.58 kj/mol, respectively. Calculate the standard enthalpy of formation of CaC2 (s) at 25° C.

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    Solution Summary

    Provides steps necessary to calculate the standard enthalpy of formation