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ch6 solutions - Questions on Concepts Q6.1 Under what...

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89 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? 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 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 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 H reaction = 0. Q6.7) The reaction A + B C + D is at equilibrium for ξ = 0.1. What does this tell you about the variation of G pure with ξ ?
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