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    Using Hess's Laws in Various Equations

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    1.) Given the following data:
    Fe2O3(s) + 3CO(g) ---- 2Fe(s) + 3CO2(g) delta H = -23 kJ
    3Fe2O3(s) + CO(g) ----- 2Fe3O4(s) + CO2(g) delta H = -39 kJ
    Fe3O4(s) + CO(g) ----- 3FeO(s) + CO2(g) delta H = +18 kJ
    Calculate delta H for the reaction
    FeO(s) + CO(g) ----- Fe(s) +CO2(g)

    2.) At 298 K, the standard enthalpies of formation for C2H2(g) and C6H6(l) are 227 kJ/mol and 49 kJ/mol, respectively.
    C6H6(l) ------ 3C2H2(g)
    Both acetylene (C2H2) and benzene (C6H6) can be used as fuels. Which compound would liberate more energy per gram when combusted in air?

    3.) Given the following data:
    4CuO(s) ---- 2Cu2O(s) + O2(g) delta H = 288 kJ
    Cu2O(s) ---- Cu(s) + CuO(s) delta H = 11 kJ
    Calculate the standard enthalpy of formation for CuO(s).

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    https://brainmass.com/chemistry/energetics-and-thermodynamics/hess-laws-various-equations-106802

    Solution Summary

    Word document shows how to use Hess's Law to find enthalpies of formation, etc.

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