Lecture+6 - The reaction Gibbs energy & Standard...

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The reaction Gibbs energy & Standard reaction Gibbs energy 0 ln GG R T Q Δ= Δ + 0 0l n GR T K = Δ+ an activityof products Q activityof react ts =
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1. Concentrations of solutes should be expressed as moles per liter. 2. Concentrations of gases should be expressed in bars. 3. Concentrations of pure solids, pure liquids, and solvents are omitted because they are unity. These conventions are arbitrary, but you must use them if you wish to use tabulated values of equilibrium constants, standard reduction potentials, and free energies. In the thermodynamic derivation of the equilibrium constant, each quantity in Equation is expressed as the ratio of the concentration of a species to its concentration in its standard state . For solutes, the standard state is 1 M. For gases, the standard state is 1 bar ( 10 5 Pa; 1 atm 1.013 25 bar), and for solids and liquids, the standard states are the pure solid or liquid.
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Lecture+6 - The reaction Gibbs energy & Standard...

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