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UW - CHEM 152 - Chem 152: Week 7 - Class Notes

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UW - CHEM 152 - Chem 152: Week 7 - Class Notes

School: University of Washington
Department: Chemistry
Course: General Chemistry
Professor: Munira Khalil
Term: Winter 2015
Tags: Enthalpy, entropy, heat, work, Hess's Law, calorimetry, pathways, and constant
Name: Chem 152: Week 7
Description: Thermodynamics continued: solubility, enthalpy, entropy
Uploaded: 02/22/2018
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School: University of Washington
Department: Chemistry
Course: General Chemistry
Professor: Munira Khalil
Term: Winter 2015
Tags: Enthalpy, entropy, heat, work, Hess's Law, calorimetry, pathways, and constant
Name: Chem 152: Week 7
Description: Thermodynamics continued: solubility, enthalpy, entropy
Uploaded: 02/22/2018
18 Pages 33 Views 26 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!

Unformatted text preview: Lecture 3.2 ErthCupy Thermodynamics of ideal gases . GT SUbstances have some county to Siore heat energy -- Kinetic energy ideal monetomic gas (KMT) KERT KE ISThe energy of motion - temperature is a measure of ine motion of the gas oroms on inuregse in system temperature leads to an Increase in the system's heat energy content, which comesponds to anincrease in system kinetic Energy . what are the energetic degrees of freedom for an faecil monatomic.gus just translation in three spatial chimensions - what happens if we add neat under constant Volume conditions? - caded energy goes to inueasing translation KEomy . what about adding heat under constant pressure conditions - System volume must increast due to increased HansichtTON KE System performs PAV work Internal energy and temperature Internal energyE-EKIE p For 1 mole of omonatomic ideal gas Potential energy is zero and Kinetic energy is gwen by NMT LE * EK + E RIIf temperature increase s, E increases AE EF- RAT * Molar hegtcopgcity: energy required to raise the temperature of more of substance by 1K -Generalning E : ERAT J .molKI) . The change in in temal chcray Is Suffiucot to deshine the effect of temperature in the constant - volume case, because all of Ine dea veat aces into increasing ilansicMund only UUDDDDDDD FEKTEp 4F = n( RAT - Temperature - insufficient for constant pressure case heat increases translating1 KE Cind doing work ontne surroundings H= E PV D Erithalpy a thermo cly namic validole 101 HOCKS and the pressure-volume" state of asystem assume t more of monatomic rclegigas H-2RT+ RI AH Hp-HI RAT D Howmuch does enthalpy of 1 mole of an TCRC,mon Chomic gas ihu ease for every 1K | 4H- RCIK): 1R . molar heat capicity: ehiha py regulled to ruse the tempat more cfsubstance bykAH-n (5R) AT (y more ! MOIGT Heatcapsicity energy required to use the temperature of 1 mole of substance by 1K - intemouen eigy EF EKIEp AfrERJAT = (mo R (IK) tinalpy H = E PV 4H-(5R) UT - (Rfimol) (E) Nolice: the neat capacities for sameg05 - measurechinges in two different themodynamic In Grigbles in same system - more enthalpy is required to increase the femperature by iKth an internali temperature Examples what ne know: 1. That is AH TOKthis process > V by Tomo H; (% R) 27 OF NCC9) from 0-15 ml (8319 (-69.05K) 10L 4G 901 constant P: - 10700 J *Ctia 130J lost I ZH preseAIS Qngngen C5 atm the py clar OTSV ich I. Is this process 3. What Is AF for this process? endathermic or exothermic? AE ARJAT 2T: TF-Ti PAY ca.15 m (2, '{IA te con1 ) (CS5)(510) (0:15 20:08206 *-645 J AR

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