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Using the enthalpy of reaction for the 2 reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone. PLEASE explain

1) ClO(g) + O3(g) ---> Cl(g) + 2O2(g) ΔH^degreerxn= -122.8 kJ

2) 2O3(g) ----> 3O2(g) ΔH^degreerxn= -285.3 kJ

3) O3(g) + Cl(g) ----> ClO(g) + O2(g) ΔH^degreerxn=

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