examIII07 - NAME and Section No. Chemistry 391 Exam III KEY...

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––––––––––––––––––––––––––––––– NAME and Section No. 1 Chemistry 391 Fall 2007 Exam III KEY 1. (30 Points) ***Do 5 out of 6 ***(If 6 are done only the first 5 will be graded)*** a). In the reaction 23 3O 2O it is found that 0.6 mol of 2 O are consumed. Find the extent of reaction, ξ 0 ii i nn νξ −= and OO 22 0 0.6 . ( ) () ( ) 2 0 O 0.6 3 0.2 = = . b) 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. . c). Define the term “triple point”. What conditions are satisfied? At the triple point three phases are in equilibrium. This means that abc p pp TTT μ μμ ==
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––––––––––––––––––––––––––––––– NAME and Section No. 2 d). Show that ,, ji i ii S V nn T V UA μ ≠≠ ⎞⎞ ∂∂ == ⎟⎟ ⎠⎠ The Gibbsian differentials for U at fixed S and V and A at fixed T and V with the inclusion of the chemical potential terms are: i i dU TdS pdV dn dA SdT pdV dn =− + + The above definitions of the chemical potential for these independent variables show they are equal. e). In setting up thermodynamic tables for the entropy, how is the third law of thermodynamics used, and what is the convention for the entropy? The third law states that the entropy change approaches zero as 0 T as long as the substance is in internal equilibrium. This feature along with the convention that the entropy at T
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examIII07 - NAME and Section No. Chemistry 391 Exam III KEY...

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