The 1995 Nobel prize in Chemistry was common by Paul Crutzen, F. Sherwood Rowland, and Mario Molina for their work worrying the formation and decomposition that ozone in the stratosphere. Rowland and also Molina hypothesized the chlorofluorocarbons (CFCs) in the stratosphere break down upon exposure to UV radiation, developing chlorine atom. Chlorine was previously established as a catalyst in the breakdown of ozone into oxygen gas.

Using enthalpy the reaction for 2 reactions v ozone, identify the enthalpy the reaction because that the reaction that chlorine through ozone.

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

2) 2O3(g) ---> 3O2(g) Hrxn = -285.3 kJ/mol

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

_______ kJ/mol


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Review Hess" Law

When you do this, you end up with the wanted equation (3):


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