question $1$

a$)$The rate equations for parallel reactions A$+$C$->$D and A$+$C$->$U are rd$=800($e$^(-2000/$T$))($Ca$^0\mathrm{.}5)$Cc and ru$=1000($e$^(3000/)$ respectively. It is given as T$))($Ca$)$Cc$.$ D is considered the desired product and U is considered the undesirable product. By writing the equation that gives the selectivity of the desired product, what should be the temperature, concentration and reactor type in order to obtain the product at the highest value? b$)$ The activation energy of a second order reaction at $300$ K with a reaction rate of $2\mathrm{.}5$ mol$/($lt$.$min$)$ was calculated as $20000$ j$/$mol$.$ What is the unit of reaction rate constant? At what temperature for this reaction will the reaction rate be $3$ times the reaction rate at $300$K$?$