Friday_Study_Session-1

Friday_Study_Session-1 - Include the products, reactants,...

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Chemistry XXI Friday Study Session January 22, 2010
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Chemistry XXI Industrial Air Pollutants Since the Industrial Revolution a steady stream of air pollutants have been released into the air that we breathe. Due to environmental and health phenomena, such as acid rain, sunsets, and asthma, the controlling of concentrations of pollutants such as Sulfur Oxides (SO x ) has gained continuous interest. How can we explain and make predictions about whether the extent of chemical reactions involving SO are favored or not favored in the atmosphere?
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Chemistry XXI A Possible Reaction Compare the relative energetic stability of reactants and products and make a prediction for the sign of ΔHº for 2 SO 2 (g) + O 2 (g) 2 SO 3 (g)
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Chemistry XXI Let’s Quantify Substance ΔHºf (kJ/mol) SO 2 -296.8 SO 3 -395.7 O 2 0 Calculate the ΔHº using the given standard enthalpy 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) Draw a reaction profile diagram for this reaction.
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Unformatted text preview: Include the products, reactants, the enthalpy of reaction, the transition state and the activation energy. Chemistry XXI The Final Factor Compare the entropic stability of reactants and products and make a prediction for the sign of ΔSºrxn for this reaction. Justify your answer. 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) Molecular Size Complexity State of Matter ENTROPIC FACTORS Chemistry XXI Directional Conclusions Remember that we have been focusing on evaluating the directionality and extent of reactions. Two factors have been our main focus: Energetic and Entropic . In this case however, we have an energetically favored reaction (- enthalpy) that is not entropically favored. Thus, to complete our analysis on air pollutants we will have to utilize skills presented in module 2. Stay tuned. ENERGETIC FACTORS ENTROPIC FACTORS Chemistry XXI Questions ???...
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This note was uploaded on 03/29/2010 for the course CHEM 152 taught by Professor Grall during the Spring '08 term at Arizona.

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Friday_Study_Session-1 - Include the products, reactants,...

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