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Apply this to equilibrium at t p and at tdtpdp to get

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Unformatted text preview: an equilibrium (reversible) process. •  S is an extensive state funcEon which characterizes the degree of disorder of the system. •  The Second Law provides a mean to predict the direcEon of spontaneous change. Spontaneous changes are always accompanied by a dispersal of energy in a more disordered form. •  dS Total = dS + dS Surr •  Entropy Calcula;ons For Reversible Processes (know how to derive these equa;ons) –  Entropy Change for Reversible Phase Transi;ons ΔStrans = ΔHtrans / Ttrans –  Entropy Change During Reversible Isothermal Expansion or Compression of ideal gas: ΔS = nR ln(Vf/Vi) –  Entropy Change During Cst P Reversible Hea;ng ΔS =CP ln(Tf / Ti ) –  Entropy Change During Cst V Reversible Hea;ng ΔS =CV ln(Tf / Ti ) –  Entropy Change during Adiaba;c Reversible Process ΔS = 0 Day #18: Fall 2011 •  Entropy Calcula;ons For Irreversible Processes: –  To determine whether a process is reversible or...
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