The 1995 Nobel Prize in Chemistry was shared by Paul Crutzen, F. Sherwood Rowlan

Question

The 1995 Nobel Prize in Chemistry was shared by Paul Crutzen, F. Sherwood Rowland, and Mario Molina for their work concerning the decomposition of formation and decomposition of ozone in the stratosphere. Rowland and na 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 enthaley of readtion for two reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone. Cl(g)-20, 2 20 AH--285.3 kJ rxn Number kJ

Explanation / Answer

1)

Answer:

Our final reaction needs to have ClO on the product side of the equation. We have to reverse the first equation, which will also change the sign of dH. (+122.8 kj/mol)

The next equation can remain as is because our final step calls for O2 as a product which we already have. Making dH: (-285.3 kj/mol)

Add them: +122.8 kj/mol + (-285.3 kj/mol)= -162.5 kj/mol   

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