5_60_lecture4

5_60_lecture4 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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MIT OpenCourseWare http://ocw.mit.edu 5.60 Thermodynamics & Kinetics Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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5.60 Spring 2008 Lecture #4 page 1 Enthalpy H(T,p) H U + pV Chemical reactions and biological processes usually take place under constant pressure and with reversible pV work. Enthalpy turns out to be an especially useful function of state under those conditions. reversible gas ( p , T 1 , V 1 ) = gas ( , 2 , 2 ) . const p U 1 2 Uq w q pV ∆=+= −∆ p ∆+∆= UpV q define as U ( V ) = q ( U p ) = q ∆+ ⇒ ∆ + HU p ⇒ ∆ = ≡+ for a reversible constant process Choose HT p ( ) dH = dT + , T dp What are and ? for a reversible process at constant ( dp = 0) = đ and = đ = but đ = C dT also = C
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5.60 Spring 2008 Lecture #4
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5_60_lecture4 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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