rhondascott26 rhondascott26

13-11-2018
Chemistry

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

arrow after the o3(g)

whats the overall enthalpy?

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AsiaWoerner AsiaWoerner

17-11-2018

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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