In practice gas mixtures containing CO, CO2, N2, etc. give much the same products as those containing CH4 and NH3 so long as there is no O2.
Na práctica as mesturas de gases que conteñan CO, CO2, N2 etc. dan nos experimentos esencialmente os mesmos produtos que as que conteñen CH4 e NH3 con tal de que non haxa O2.