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Main_ISM_ch06 - Chapter 6 Chemical Equilibrium Problem...

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6-1 Chapter 6: Chemical Equilibrium Problem numbers in italics indicate that the solution is included in the Student’s Solutions Manual. Questions on Concepts Q6.1) Under what conditions is 0 dA a condition that defines the spontaneity of a process? This is the case at constant T and V if no nonexpansion work is possible. Q6.2) Under what conditions is 0 dG a condition that defines the spontaneity of a process? This is the case at constant T and P if no nonexpansion work is possible. Q6.3) Which thermodynamic state function gives a measure of the maximum electric work that can be carried out in a fuel cell? Δ G because nonexpansion dG dw ≤ / Q6.4) By invoking the pressure dependence of the chemical potential, show that if a valve separating a vessel of pure A from a vessel containing a mixture of A and B is opened, mixing will occur. Both A and B are ideal gases, and the initial pressure in both vessels is 1 bar. The chemical potential of A is lower in the mixture than in the pure gas because ( ) ( ) , ln A A A P T P T RT P μ μ = + o o , and P A < P º. Because mass flows from regions of high chemical potential to regions of low chemical potential, pure A will flow into the mixture, and the contents of both vessels will be mixed. Q6.5) Under what condition is K P = K x ? This is the case for a reaction involving gases if Δ n = 0. Q6.6) It is found that K P is independent of T for a particular chemical reaction. What does this tell you about the reaction? This is true if Δ H reaction = 0.
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