Here, 𝑀 𝑖 is the molar mass of species 𝑖, 𝑟 𝑗 is the rate of stoichiometric reaction 𝑗 and 𝜈 𝑖𝑗 the corresponding stochiometric coefficient of species 𝑖. Equation ( ) is applied to all components except N2, for which equation ( ) is applied instead. This strategy allows to lump small numerical errors in the balance of the inert component N2.