HW5%20Chap3

# HW5%20Chap3 - H since E =(H P V = H P V V = the change in...

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BME 100L. Modeling Cellular and Molecular Systems Final 2009 Homework 5 Chapter 3. Problems 4, 7, 9, 11, and 13 Due: 5pm, Oct.23 rd Hints 3.4 (a) Show that S = -nRln(P 2 /P 1 ) for a pure substance. The initial pressure of A is P 0 = 1 atm. After mixing A and B, the final pressure is P A = X A P 0 . (c) G is defined as (H – TS). 3.7 (a) not required (b) q = 0, V = 0, P = constant, the process is irreversible. (c) For expansion, dV > 0 (d) During the incubation of the bacteria, T = constant, P = 1 atm, w = 0 (assuming no formation of gases from the bacteria.) The metabolism of bacteria will convert chemical energy in nutrients to heat. Determine if q is greater or smaller than 0. The conversion of chemical energy to heat is irreversible. 3.9 (a) An ideal catalyst will increase the rate of chemical reaction only if it can happen spontaneously without the catalyst since the enzyme has no effects on G, H, and S. 3.11 E 0 is not available in the Tables at the end of the textbook but can be estimated based on

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Unformatted text preview: H since E = (H- P V) = H- P V. V = the change in molar volume of the system. Assuming that C 2 H 6 and O 2 are ideal gases and the molar volume of gas >> the molar volume of liquid. Based on your calculation, what are the relative contributions of H and P V to E ? T P T dT C H H 298 . r H is known but C P is unknown. At 500 C, ethanol will become vapor. Thus, the total change of enthalpy is H t = H T + trs H, where trs H is the enthalpy change for phase change which is also unknown. 3.13. ) atm ( G ) atm ( G ) atm ( G ) atm ( G A C B 100 100 100 100 where A = CH 3 COCOOH (l), B = CH 3 CHO (g), and C = CO 2 (g) For isothermal process, determine the pressure dependence of G for liquid and ideal gases separately based on the equations discussed in the class. Is the pressure dependence of G negligible?...
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