0 votes
20 views
ago in PhotoChemistry by (2.1k points)
What is the effect of temperature on the photochemical reaction rate of the photolysis of nitric oxide (NO) gas in the presence of ozone (O3)?

1 Answer

0 votes
ago by (2.5k points)
The effect of temperature on the photochemical reaction rate of the photolysis of nitric oxide  NO  gas in the presence of ozone  O3  can be explained using the Arrhenius equation and considering the energy of the photons involved in the reaction.The photolysis of nitric oxide  NO  in the presence of ozone  O3  can be represented by the following reactions:1. NO + O3  NO2 + O2  Reaction 1 2. NO2 + sunlight  UV light   NO + O  Reaction 2 3. O + O2  O3  Reaction 3 The overall reaction is a photochemical smog-forming cycle that converts O2 to O3 and back. The rate of these reactions depends on the concentration of the reactants, the intensity of sunlight  UV light , and the temperature.The Arrhenius equation describes the temperature dependence of reaction rates:k = Ae^-Ea/RT where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin.For Reaction 1, the rate constant will increase with increasing temperature, as the reaction is exothermic and the activation energy is positive. This means that the reaction will proceed faster at higher temperatures.For Reaction 2, the rate of the reaction depends on the intensity of sunlight  UV light  and the absorption cross-section of NO2. The temperature has a minimal effect on the rate of this reaction, as it is primarily driven by the energy of the photons rather than the thermal energy of the molecules.For Reaction 3, the rate constant will also increase with increasing temperature, as the reaction is exothermic and the activation energy is positive. This means that the reaction will proceed faster at higher temperatures.In summary, the effect of temperature on the photochemical reaction rate of the photolysis of nitric oxide  NO  gas in the presence of ozone  O3  is as follows:1. The rate of Reaction 1 and Reaction 3 will increase with increasing temperature due to the positive activation energy.2. The rate of Reaction 2 is primarily dependent on the intensity of sunlight  UV light  and has minimal dependence on temperature.Overall, an increase in temperature will generally lead to an increase in the reaction rates of the photochemical smog-forming cycle involving NO, O3, and NO2. However, the rate of the photolysis reaction  Reaction 2  is primarily dependent on the intensity of sunlight rather than temperature.
Welcome to Sarvan Science Q&A, where you can ask questions and receive answers from other members of the community.
...