Radical-chain process co-oxidation of two hydrocarbons

Let us consider the situation, when more than one final reaction proceeds in the system, for example, liquid-phase co-oxidization of two hydrocarbons R H and R2H  

Under the simplest variant the following elementary reactions of chain propagation are considered  

the route U realizes only the final reaction Q, Vi realizes only the final reaction Qi and the route t/.i realizes both final reactions in the stoichiometric form ((2.36) and (2.37)). 

For an illustration let us complicate the kinetic scheme (2.38) by adding the reversible elementary reaction of a change between the radicals and R2  

Every one of these routes realizes only Qt or Q2. Under this variant their rates are  

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