The gas phase reaction A$->$B $+2$C takes place at $550\backslash$deg C temperature and $2\mathrm{.}5$ atm pressure in a batch reactor with a $($fixed$)$ volume of $104$ dm$^3.80\%$ inert and $20\%$ A substance is fed into the reactor.

a$-$ Create the stoichiometric table.

b$-$ If the reaction is elementary, the reactor is isothermal and the rate constant is $0\mathrm{.}5$ hour$,$ calculate the time required to achieve $85\%$ conversion.

c$-$ Calculate Cc and reactor pressure if $85\%$ conversion is achieved.