up:: [[Combustion]] Stoichiometric ratio is the ratio of the oxidizer to fuel for perfect combustion. ## 1. More technical definition Stoichiometric mixture is the mixture of reactants gives products with highest negative [[Enthalpy of formation]]. In a C-H-O reaction the products with highest negative heat of formation $CO_2$ and $H_2O$ Stoichiometric ratios of common propellants | Propellants | Stoich. O/F Ratio | | ------------------- | ----- | | LOX/H2 | 7.98:1 | | RP1($C_{12}H_{26}$) | 3.41 | | LNG ($CH_4$) | 3.99 |