HW6%20Chap4 - a = c where is the activity coefficient In...

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BME 100L. Modeling Cellular and Molecular Systems Spring 2009 Homework 6 Chapter 4. Problems 1, 2, 3, 4, 5, 8, and 9 Due: 5pm, Nov.2 Hints 4.1. ' 0 G is the standard molar Gibbs free energy at pH 7. ' 0 298 G can be found in the textbook. 4.2.(a) For the reaction ATP + H 2 O ADP + Pi, Q is often expressed as [ADP][Pi]/[ATP]. The questions are (i) why H 2 O is not included in the calculation of Q? (ii) Will Q has a unit of concentration? What is the relationship between w max and G? 4.3. None. 4.4. (a) ] ATP [ ] Glu [ ] Pi ][ ADP [ ] Glu [ Q 2 out 2 in (why?) Q ln RT ) T ( G ) T ( G 0 r r . What is the maximum value of r G if w* = 0? What is the maximum value of Q when r G 0 and T are fixed? What is the relationship between in glu ) G ( and out glu ) G ( if the chemical environment in red blood cells is the same as that in the blood. (c) The activity a is related to the concentration c:
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Unformatted text preview: a = c, where is the activity coefficient. In non-ideal solutions, Q is defined by the activity. Thus, the calculation in parts (a) and (b) will provide only activity ratio. In dilute solutions, activity ratio = concentration ratio. In non-ideal solutions, activity ratio = ratio of c, from which you can determine if the concentration ratio is greater or less than the activity ratio. 4.5. None. 4.8. In non-ideal solutions, use only activity in Q and K. Treat it mathematically the same as the concentration in all your calculations. (c) Assume the solution is dilute (since c = 0.1 M). Thus, a = c. (e) The ratio of K at different temperatures is related to the enthalpy of reaction (see your notes). 4.9. None....
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