k 2.31e-5*exp(20.492-104200/(Rg*T)) Arrhenius expression Kp 5.088e5*exp(-91200/(Rg*T)) Arrhenius expression kH exp(163200/(Rg*T)-22.426) Arrhenius expression ka 43240*exp(135600/(Rg*T)-32.077) Arrhenius expression p_CH4 c_CH4*Rg*T/1e5 Pressure, CH4 p_H2 c_H2*Rg*T/1e5+eps Pressure, H2