Essence7958 Essence7958 Today at 3:22 AM Chemistry Answered Calculate the standard enthalpy change of the reaction ClO(g) + O3(g) ---> ClO2(g) = 02(g) Standard enthalpies are: ClO(g) is 101; for O3 is 142.3; for O2 is 0; for O(g), is 247.5.