Thermochemistry

 

 60) 2H2(g) + O2(g) 2H2O(g)              ΔH = -483.6 kJ          

                    3O2(g) 2O3(g)                  ΔH = +284.6 kJ

      

      3H2(g) + O3(g) 3H2O(g)                ΔH = ?

 

      3H2(g) + 3/2O2(g) 3H2O(g)           ΔH = 3/2(-483.6 kJ)

                          O3(g) 3/2O2(g)           ΔH = 1/2(+284.6 kJ)
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           3H2(g) + O3(g) 3H2O(g)           ΔH = -867.7 kJ