Lecture_05

Therefore i have chosen to denote this quantity by

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Unformatted text preview: e fraction through the activity coefficient γA: aA ? A = x A , or a A = ? A x A. Note that the textbook uses the symbol fA for activity coefficient of A. This causes confusion with fugacity, which is also denoted by f. Therefore, I have chosen to denote this quantity by the Greek letter γ (gamma). Example 5.8, Problems: 5.34, 5.35. 6 5.5. Partial Molar Quantities Partial Molar quantities are required to deal with open systems, i.e., systems that permit mass transfer between themselves and surroundings. Consider an open system with n1 moles of component 1, n2 moles of component 2, n3 moles of component 3, etc.. We would write the free energy change dG for such a system as dG = æ ¹G ö dP + æ ¹G ö dT + æ ¹G ö dn + ... ç ¹n ÷ è ¹P ø T,n 1 ,n 2,... è ¹T ø P,n 1 ,n 2,... è 1 ø P,T,,n 2,... 1 = VdP − SdT + G 1 dn 1 + G 2 dn 2 + ... In the second equality, the quantities G1, G2, etc.. are called partial molar free energies. Similarly, we may define partial molar volumes, partial molar...
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