Calculating Heat Energy Released in Ozone Decomposition Reaction

[rhenretta]

I have been doing some research on ozone recently, and I have a question that none of my resources have answered...

The following reaction is an exothermic reaction, but how would I calculate the amount of heat energy is released?

[itex]O_{3} \underbrace{\rightarrow}_{uv\ light} O_{2} + O[/itex]

where uv wavelength < 290nm

 

[rhenretta]

Am I on the right track? I looked up the energy of the covalent bonds, and in the destruction of ozone, there is a loss of a single covalent bond between 2 oxygen atoms. Therefore the energy released would be 146 kJ / mol?

 

[jd12345]

not sure but ozone has resonating structures so that might add something to its stability and hence can effect the energy released

 

[ajkoer]

Would not a good guess be the heat of formation for ozone minus the energy required to split O2 (that is, create mono-atomic oxygen)? I am assuming that the O3 is prepared by passing an electric arc through air.

1. O2 --Energy--> O + O

2. O2 + O ---> O3

Now, if you do otherwise derive an estimate, then you also have an estimate of the energy required for Equation [1], or at least, a sanity check.

 

[LudusRex]

To calculate the amount of heat energy released in the ozone decomposition reaction, you will need to use the equation for calculating enthalpy change (ΔH) of a reaction. This equation is ΔH = ΣH(products) - ΣH(reactants), where ΣH represents the sum of the enthalpies of the products or reactants.

In this case, the products are O2 and O, and the reactant is O3. You will need to determine the enthalpies of each of these substances at the given temperature and pressure. Then, substitute these values into the equation to calculate the enthalpy change of the reaction, which represents the amount of heat energy released.

However, it is important to note that the amount of heat energy released in a reaction can also be affected by other factors such as the amount of reactants present and the efficiency of the reaction. Therefore, the calculated value may not be an exact representation of the actual heat energy released. It is also important to consider any energy changes that may occur due to other processes (such as light absorption) during the reaction.

I hope this helps answer your question. Keep in mind that calculating heat energy released in a reaction can be a complex process and may require further research and experimentation. It is always best to consult with a qualified scientist or reference reputable sources when conducting scientific research.