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For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm...

For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction N2(g)+3H2(g)==<>2NH3(g) the standard change in Gibbs free energy is Delta G=-72.6 kJ/mol. What is Delta G for this reaction at 298 K when the partial pressures are

P N2 = 0.200 atm, P H2 = 0.150 atm, and P NH3 = 0.900 atm

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Answer #1

    N2(g)+3H2(g)==<>2NH3(g)

   kp   = P2NH3/PN2 P3H2

         = (0.9)2/0.2*(0.15)3

            = 1200

G0   = -72.6KJ/mole = -72600J/mole

G   = G0 + RTlnKp

         = -72600+ 8.314*298*ln1200

          = -72600+ 2477.57*7.1

           = -55009.25J

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