notes_Lecture_06_101310_revised

notes_Lecture_06_101310_revised - Lecture 6: Intro to...

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Unformatted text preview: Lecture 6: Intro to Entropy Reading: Zumdahl 10.1 and 10.3 Outline eaction spontaneity (10.1) Reaction spontaneity (10.1) Statistical interpretation of entropy and Boltzmanns formula (10.3) Announcements Announcements HW #2 Due today HW #3 Posted Due on Friday, Oct. 22 Office Hours Notes for Chapter 9 Complete with all calculations CHEM 152A Office Hours Time/Day Monday Tuesday Wednesday Thursday Friday 8:30 AM 9:00 AM Jon Cox 9:30 AM 10:00 AM 10:30 AM 11:00 AM 11:30 AM Abhinav Dhall 12:00 PM 12:30 PM Mike Carroll 1:00 PM 1:30 PM 2:00 PM 2:30 PM Chelsea Hess Chelsea Hess 3:00 PM Leah Miller Leah Miller 3:30 PM 4:00 PM Jon Cox Abhinav Dhall 4:30 PM 5:00 PM Mike Carroll 5:30 PM 6:00 PM Enthalpy and Spontaneity Early on in the development of thermodynamics, it was believed that if a reaction was exothermic, it was spontaneous. Example: spontaneous combustion White Phosphorus, P 4 hite Phosphorus But consider the following process: H 2 O(s) H 2 O(l) H rxn = +6.02 kJ Endothermic..yet spontaneous! White Phosphorus http://www.youtube.com/watch?v=dvo6Q5nbI9Q Challenge Problem 9.94 You have 2.4 mol of a gas contained in a 4.0 L bulb at a temperature of 32C. This bulb is connected to a 20.0 L sealed, initially evacuated bulb via a valve. Assume the temperature remains constant. What should happen to the gas when you open the valve? Calculate any changes of condition. The gas will flow out of the 4.0 L bulb into the 20.0- L bulb. Eventually, the gas will be evenly dispersed throughout the two bulbs. The pressure will be the same inside both bulbs. The moles of gas (n) and the temperature (T) are constant. However, as the gas expands from 4.0 L to 24.0 L, the pressure will decrease. atm 15 L 4.0 K) 305 )( mol K atm L (0.08206 mol 2.4 V nRT P P-1-1 i i initial = = = = atm 5 . 2 L 24.0 L) atm(4.0 15 V V P P P f i i f final = = = = Calculate H, E, q and w for the process described in previous slide....
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notes_Lecture_06_101310_revised - Lecture 6: Intro to...

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