Use the polymerization of m$-$phenylenediamine and terephthalic acid

below to answer the following questions

$1.$ what is the repeat unit and average molar mass of the repeat unit

$2.$ Assuming a conversion of acid of $0\mathrm{.}9951$ and an equimolar reaction mixture of the two

monomers, what are the expected Mn$,$ Mw$,$ and $$ for this polymerization?

$3.$ If $2$ mol$\%$ of butyl amine on a m$-$phenylenediamine basis was added to the mixture and

run to the same conversion of acid in part b$),$ what is the predicted number average

molecular weight of the polymer now considering the impurity? Hint: Assume a basis of

moles for the initial mixture