ws3302key-1 - CH302 Worksheet 3Introduction to Chemical...

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CH302 Worksheet 3—Introduction to Chemical Equilbria Answer Key 1. Write a mass action quotient (aka mass action expression) for the general equation below: aA + bB cC + dD Q = [C] c ·[D] d / [A] a ·[B] b 2. What sort of mathematical relationship exists between Δ G and K? Which of these terms should have a wider range of possible values? There is a log-linear (aka exponential) relationship between Δ G and K - when Δ G increases, K increases exponentially. K should have a wider range of values, since it is proportional to the base e exponent of Δ G, i.e. if Δ G is doubled, K will increase by a factor equal to e 2 . 3. What is the difference between Q and K? Q can have any value depending on the concentrations of reactants and products, and it can describe any and all non-equilibrium states for a system. K, on the other hand, can have only one value at a given temperature and pressure and that value is always equal to the mass action quotient when the system is at equilibrium.
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This note was uploaded on 06/14/2011 for the course MATH 305G taught by Professor Cathy during the Spring '11 term at University of Texas at Austin.

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ws3302key-1 - CH302 Worksheet 3Introduction to Chemical...

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