PChemexam063 - NAME and Section No. Chemistry 391 Exam III...

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––––––––––––––––––––––––––––––– NAME and Section No. 1 Chemistry 391 Fall 2006 Exam III KEY 1. (25 Points) ***Do 4 out of 5 ***(If 5 are done only the first 4 will be graded)*** a). How is the chemical potential defined? When the chemical potential of two phases are equal what is in equilibrium? () ,, ji ii Tpn n Gn µ =∂ ∂ . When equal between phases material equilibrium (no net matter flow). b). Define with a mathematical expression the extent of reaction, ξ . Define all terms in your expression. 0 i nn v =− , where 0 i n ( i n ) is the initial/reference (instantaneous) number of moles of species i present, and i ν is the stoichiometric coefficient for species i . c). State the convention I and convention II definitions of activity coefficients. Which one(s) correspond to a hypothetical standard state? Convention I. All components, solvent and solutes treated equally with all , 1 Ii γ for 1 i x . Thus standard states are pure substances. Convention II. Solvent “ A ” as in convention I. Solutes satisfy , 1 II i for 0 i x ( iA ) (equivalent to 1 A x ). Convention II solutes correspond to hypothetical standard states.
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This note was uploaded on 09/28/2008 for the course CEM 391 taught by Professor Cuckier during the Fall '08 term at Michigan State University.

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PChemexam063 - NAME and Section No. Chemistry 391 Exam III...

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