Ammonia synthesis kinetics near equilibrium is considered for an induced inhomogeneous surface using the electronic gas model. At medium nitrogen surface coverage, the resultant kinetic equation matches the Temkin-Pyshev equation. The rate model is then evaluated at high nitrogen pressures assuming an irreversible reaction, finding that the predicted rate is different from first order in nitrogen. Compared to an alternative rate equation, derived from the use of biographical nonuniformity, which predicts first-order kinetics in nitrogen, this model is superior because it matches the observed behavior better.