A $21\mathrm{.}5$ g sample of C$6$H$6$ reacts with excess HNO$3$ to produce $19\mathrm{.}4$ g of C$6$H$5$NO$2.$

C$6$H$6($I$)+$ HNO$3($aq$)$ C$6$H$5$NO$2($I$)+$ H$2$O$($I$)$

A$.)$ What is the theoretical yield of C$6$H$5$NO$2$ in this experiment.

B$.)$ What is the percent yield if the theoretical yield was $28\mathrm{.}33$g$.$