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    Solving Enthalpy Changes for Chemical Reactions

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    Calculate the enthalpy change for the following reactions
    P4O6 + 2O2 ? P4O10
    given the following enthalpies of reaction.

    P4 + 3O2 ? P4O6 ?H = -1640.1 kJ equation 1
    P4 + 5O2 ? P4O10 ?H = -2940.1 kJ equation 2

    b) NO2(g) + (7/2) H2(g) ---> 2H2O(l) + NH3(g)

    2NH3(g) ---> N2(g) + 3H2(g) ?H° = +92 kJ equation 1
    (1/2) N2(g) + 2H2O(l) ---> NO2(g) + 2H2(g) ?H° = +170 kJ equation 2

    Please provide detailed explanations.

    © BrainMass Inc. brainmass.com October 10, 2019, 5:47 am ad1c9bdddf
    https://brainmass.com/chemistry/energetics-and-thermodynamics/solving-enthalpy-changes-chemical-reactions-517368

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    The expert examines solving enthalpy changes for chemical reactions.

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