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.