1Physical Chemistry I for BiochemistsChem340Lecture 8 (1/30/09)Yoshitaka Ishii•Ch. 2.8-10 (Skip printing p2-4 if you have lec. note 7) •Derivative & Partial Derivatives•Intro of Ch3. •HW3Announcement•We will start a study group from next Monday right after the class. •Quiz 1 will be held in the discussion class.•ACCC reported that they fixed problems related to printing of pdf files. If you still find problems, report it to [email protected]with specific problems and information on the site and computer you used.
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22.8 Determining ΔU & Introduction of Enthalpy H: a New State Function(1) Relationship between U and q under a constant V•If w= PdV = 0,ΔU = q ÆΔU can be determined by heat under a constant V as(2) What about it if P = const? ΔU = q + w = ΔU = q - PextΔVÆq = ΔU + PextΔV(3) Let us define H as (4) Relationship between H and q under a constant PintΔUV= qvH ≡U + PintVΔHP= ΔU + P ΔV = qp(for reversible process)2.9 Calculating q, w , ΔU, ΔH for Ideal Gas (Note: all the equations in this section of the text are valid only for Ideal Gas))()(inifinVTTVVTTCdTTCqUfinini−===Δ∫HTTCdTTCqinifinPTTPPfininiΔ=−==∫)()(TCTnRCTnRTCTnRUnRTUPVUHpVVΔ=Δ+=Δ+Δ=Δ+Δ=Δ+Δ=Δ+Δ=Δ)()()(