Under anaerobic conditions, by using dry Chlorella microalgae ( ? ? 1 . 9 9 5 ? 0 . 5 2 5 ? 0 . 0 8 4 ) ?as the substrate, Saccharomyces cerevisiae yeast ( ? ? 1 . 2 ? 0 . 5 ? 0 . 2 ) ?produces bioethanol ( ? 2 ? 5 ? ? ) ?as the product. During the reaction, ? ? 3 ?is used as the nitrogen source. The yield of biomass from the substrate is 0 . 5 4 4 ? ? . Accordingly, please answer the following questions: a ) ?Write the stoichiometric balance equations, calculate the stoichiometric coefficients of the reaction components and the respiratory quotient ( RQ ) . b ) ?Calculate the yield of bioethanol product from the dry microalgae substrate.