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Unformatted text preview: Name April 9, 2007 Chemistry 120B Hour Examination Useful formulas First and second laws at equilibrium for a rubber band of length L and mass N at temperature T under tension f give: dU = T dS + fdL + μdN where U is internal energy, S is entropy, and μ is chemical potential. Gibbs-Duhem equation for a one-component fluid: dμ = sdT + vdp where μ is chemical potential, s is entropy per mole (or molecule), v is volume per mole (or molecule) and p is pressure. x component of electric field, E x , and electric potential φ :- dφ dx = E x Electric field at position r due to point charge q at the origin: E = q r 3 r Debye’s inverse screening length for an electrolyte solution containing ions of charge ze and- ze in a solvent with deielectric constant ² : κ = r 8 πβe 2 z 2 I ² where β- 1 = k B T , e is the electronic charge, and I is the concentration of positive ions (or negative ions)....
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This note was uploaded on 09/20/2011 for the course CHEMISTRY 120 taught by Professor Head-gordon during the Spring '11 term at ASU.
- Spring '11