Question

Estimate the value of the equilibrium constant at 625 K for each of the following reactions. ΔH∘f and S∘ for BrCl(g) is 14.6 kJ/mol and 240.0 Jmol⋅K, respectively. Part A 2NO2(g)⇌N2O4(g) Please be fast because it will soon be over by 11:59pm. Thank you

Answer 1

Part A

2NO2(g)   <-------------->   N2O4(g)

ΔH∘rxn = ΔH∘f products - ΔH∘f reactants

            = 11.1 - (2 x 33.2)

           = - 55.3 kJ/mol

ΔSorxn = 304.4 - (2 x 240.1)

            = - 175.8 J/K

ΔGo = ΔH∘ - T ΔSo

        = - 55.3 - 625 x (- 0.1758)

        = 54.58 kJ/mol

ΔGo = - RT ln K

54.58 = - 8.314 x 10^-3 x 625 x ln K

K = 2.75 x 10^-5

Equilibrium constant K = 2.75 x 10^-5