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chapter7

# chapter7 - Reaction Equilibrium Thermodynamic Consideration...

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Reaction Equilibrium Thermodynamic Consideration: At constant temperature and pressure, system tends to adjust its composition such that the Gibbs energy is a minimum.

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How does one predict equilibrium position using thermodynamic data and how does the position of equilibrium depend on the conditions? Extent of Reaction
Reaction Gibbs Energy Consider N 2 (g) + 3 H 2 (g) 2 NH 3 (g) At given T and p, starting from some mixture if dn moles N 2 react with 3 dn moles H 2 to give 2 dn moles NH 3 , the corresponding change in the Gibbs energy is dG = {2 μ NH3 - ( μ N2 + 3 μ H2 )} dn ie., ( G/ n) T,p = {2 μ NH3 - ( μ N2 + 3 μ H2 )} = r G, the Reaction Gibbs Energy. It is the slope of the G vs. n graph at the given composition. It is also the change in G when the reactants are converted to products at the given T, p, and composition.

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For the general reaction aA + bB cC + dD, at given T and p, at some arbitrary composition, the Reaction Gibbs Energy is given as
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chapter7 - Reaction Equilibrium Thermodynamic Consideration...

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