Help anybody with this probelm! Its a standard gibbs free energy of reaction problem?

Thu, Sep 2, 2010

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Is the reaction of PCl5(g) with water to give an aqueous mixture of hydrochloric and phosphoric acids spontaneous (in the sense that K > 1) at 298 K? I know it is spontaneous buy how do you calculate the standard gibbs free energy of reaction?? ΔG°r

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One Response to “Help anybody with this probelm! Its a standard gibbs free energy of reaction problem?”

  1. im Says:
    2. September 2010 at 2:25 pm

    Use the standard Gibbs free energy and the rxn conditions to calculate the Gibbs free energy for your rxn. If it’s < 0, the rxn is spontaneous.

    dG = dG0 + RT ln Q

    where Q is the same ratio of concentrations you use in calculating equilibria:

    Q = prod( [product] ) / prod( [reactants] )

    (Of course, when Q = K the rxn is at equilibrium, with dG = dG0.)

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