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Lecture_Notes_101609b

# Lecture_Notes_101609b - and ∆ S o for the reaction...

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Free Energy and Equilibrium y Consider the sublimation of iodine at 25.0 o C. G o rxn = 19.3 kJ y Find G rxn at 25 o C under the following conditions: y P I2 = 1.00 mmHg y P I2 = 0.100 mmHg y Explain why iodine spontaneously sublimates in open air at 25.0 o C.

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Free Energy and Equilibrium y Consider the dissociation of HF. The K a = 7.2 x 10 -4 at 25.0 o C. Calculate G for the reaction under the following conditions. y [HF] = 0.98 M, [H + ] = [F - ] = 2.7 x 10 -2 M y [HF] = [H + ] = [F - ] = 1.0 x 10 -5
Consider the same dissociation as the last slide, but [HF] = [F - ] = 0.27 M, [H + ] = 7.2 x 10 -4 M. What is the value of G? 17.9 kJ 35.9 kJ 0 kJ 8.95 kJ 27% 11% 29% 34% 1. 17.9 kJ 2. 35.9 kJ 3. 0 kJ 4. 8.95 kJ

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Temperature Dependence of K
Temperature Dependence of K y The K b for ammonia is 1.710 x 10 -5 at 20 o C and 1.892 x 10 -5 at 50 o C. What are the values of

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Unformatted text preview: and ∆ S o for the reaction? Temperature Dependence of K Work and Free Energy y The maximum possible useful (not PV) work obtainable from a process at constant temperature and pressure is equal to the change in free energy. Work and Free Energy y Reversible Process – the universe is unchanged once the process is complete y Irreversible Process – the universe is changed once the process is complete; all real processes are irreversible processes. Work and Free Energy Practice y CO and NO are polluting gases contained in automobile exhaust. Under certain conditions, these gases can be made to N 2 and CO 2 . y Write a balanced equation for this reaction: y Identify the oxidizing and reducing agents:...
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