39. Find the thermal effect of the reaction of the conversion of 1 mole of oxygen into ozone, if 3As2O3 (tv) 3O2 (g) = 3As2O5 (tv) , ΔH0298 = -1170.8 kJ, 3As2O3 (tv) 2O3 (g) = 3 As2O5 (tv) , ΔH0298= -886.2 kJ.
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