Calculate the standard enthalpy change (H) (in kJ) for the following reaction: 2 \ SO_2(g) + O_2(g) \to 2 \ SO_3(g), \Delta H^o \ _{rxn} = -196 kJ What is enthalpy of formation? Estimate the standard enthalpy change for the reaction 2H_2O_2(l) \to 2H_2O(l) + ...