Ma P Chem 10/19, 10/21
Ma P Chem 10/19, 10/21 CHEM 345
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This 2 page Class Notes was uploaded by Kayli Antos on Saturday October 24, 2015. The Class Notes belongs to CHEM 345 at Towson University taught by Dr. Ma in Summer 2015. Since its upload, it has received 16 views. For similar materials see Physical Chemistry in Chemistry at Towson University.
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Date Created: 10/24/15
P Chem Ma Fall 2015 Q Gibbs AndH Lmh91tzEncrg And Their Applications 0 P y e12iqgiam 9 9 9 G D A plot of pressure vs temperature For real gases because only real gases can be condensed to liquid phase The curves on the graphs are the phase boundaries where two phases exist in equilibrium The equation of the lines are the Clapeyron Equation The solid liquid boundary is melting points If the pressure is 1 atm then that s the normal MP The liquid gas boundary is vapor pressures If vapor pressure is equal to external pressure that s the boiling point If the vapor pressure and external pressure and both equal to 1 atm that s the normal BP The triple point is where all three phases exist at equilibrium It s also the lowest temperature where liquid can exist except for water The critical point state is where gas and liquids exist supercritical uid Liquid water can exist below the triple point but only at slightly lower temperatures and pressures Under normal conditions carbon dioxide doesn t exist as a liquid only as a solid or gas This is why dry ice sublimes 0 NQQELIEQLTQlYtESQLUILQIlS 0 Partial Mglcy EIngrLies D The contribution per mole that a substance makes to an overall property of a mixture 0 Partial Mglcy Y0l 41212071 9 D D 9 9 The contribution per mole that a substance makes to the total volume of a mixture At constant temperature and pressure V Vn1 n2 nN For a two component mixture V Vn1 n2 The total differential is dV 2 a V 6V 5 quot1 TPn2 dnl dnz anz TPn1 Integrate both sides fOV dV 2 fonl Vldnl fonz I72an V V1711 V2712 0 Partial Mglcy 6112115 EnerngGL D 9 9 66 At constant temperature and pressure GL 2 aniTPnj For a two component mixture G 11151 11252 QhemjeaLlBQEEQtja quotIL A measure of the ability of a component to bring about physical and chemical change pa 1 ui 1 G n1u1 112142 The Ther1r19dynamiqs imiziiqg For an ideal gas at constant temperature A6 erni Z 1 x If P1P01 bar P2P and 6 60 RT In For a single component in a mixture of ideal gases ul u RT 1n For an ideal gas at constant temperature and pressure The entropy of mixing AmiXS AmiXS R11AlllXA 1113 In X13 The enthalpy of miXing AmiXH AHA AHB O for 2 ideal gases at constant T and P The Qibhsl311ergy91 Mixing 4mg quotll AmiXG AmiXH TAijS RTnA lIlXA 1113 lIlXB 1 Because the mole ratios of each compound are both between 1 and zero their natural logs are negative which makes AmiXG
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