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Ozone, O3(g), is a form of elemental oxygen that plays an important role in the absorption of ultraviolet radiation in the stratosphere. It decomposes to O2(g) at room temperature and pressure according to the following reaction:

 

Which has the higher enthalpy under these conditions, 2 O3(g) or 3 O2(g)?

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Coleen Amado
Coleen AmadoLv10
20 Nov 2020

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Related questions

Ozone, O3, decomposes to molecular oxygen in the stratosphere according to the reaction 2 O3(g) 3 O2(g). Would an increase in pressure favor the formation of ozone or of oxygen?

The 1995 Nobel Prize in Chemistry was shared by Paul Crutzen, F. Sherwood Rowland, and Mario Molina for their work concerning the formation and decomposition of ozone in the stratosphere. Rowland and Molina hypothesized that chlorofluorocarbons (CFCs) in the stratosphere break down upon exposure to UV radiation, producing chlorine atoms. Chlorine was previously identified as a catalyst in the breakdown of ozone into oxygen gas. Using the enthalpy of reaction for two reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone.

1. ClO(g)+O3(g)------>Cl(g)+2O2(g) Delta Hrxn=-122.8KJ/mol

2. 2O3(g)------>3O2(g) Delta Hrxn=-285.3 KJ/mol

3. O3(g)+Cl(g)------->ClO(g)+O2(g) Delta Hrxn=?

Ozone is depleted in the stratosphere by chlorine from CF3Cl according to the following set of equations:
CF3Cl + uv light --> CF3 + Cl
Cl + O3 --> ClO + O2
O3 + uv light --> O2 + O
ClO + O --> ClO + O2

what total volume of ozone at a pressure of 25.0 mmHg and a temperature of 225 K is destroyed when all of the chlorine from 15.0 g of CF3CL goes through ten cycles of the given reaction?.

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