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Unformatted text preview: Chem120B Problem Set 8 Due: April 1, 2011 1. Problems 26-17 and 26-39 in McQuarrie & Simons Physical Chemistry textbook. 2. In class we have examined separately the implications of standard state chemical potentials for par- titioning of a solute between different phases, and for chemical equilibria. In this problem you will establish and explore connections between these issues of mass equilibrium. Consider the thermodynamic cycle sketched below, in which the reactant R and product P of a chem- ical reaction are in equilibrium with one another, in the gas phase (g) as well as in liquid solution ( ). The division of these dilute molecules between gas and liquid phases is also at equilibrium. R(g) P(g) R( l ) P( l ) K eq (g) K eq ( l ) (i) Let (0) R (g) , (0) R ( ) , (0) P (g) , (0) P ( ) be the standard state chemical potentials of R(g) , R( ) , P(g) , and P( ) , respectively. Laws of mass action for the gas-phase and solution-phase reactions read P (g) R (g) = K eq (g) , and P ( ) R ( ) = K eq ( ) . Write the equilibrium constants K eq (g) and K eq ( ) in terms of standard state chemical potentials, temperature T , and perhaps the standard state density (which we will take to be consistent across...
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