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12 June, 17:27

3h2 (g) + o3 (g) 3h20 (g)

arrow after the o3 (g)

whats the overall enthalpy?

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  1. 12 June, 18:29
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    The overall enthalpy of reaction will be calculated from enthalpy of formation of products and reactants.

    DeltaHrxn = [Sum of enthalpy of formation of products] - [sum of enthalpy of formation of reactants]

    DeltaHrxn = 3 X deltaHf (H2O) - [ 3 X DeltaH (H2) + DeltaH (O3) ]

    DeltaHrxn = 3 X (--242) - [ 0 + 143] = - 869 kJ / mole

    We can also calculate the enthalpy of reaction from bond energies
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