Question $1$

Ammonia reacts with oxygen according to $4N{H}_3+5O_{2}4NO+6H_{2}O$

If $50kg$ of ammonia is fed to a batch reactor with $140kg$ of oxygen,

a$)$what is the percent in excess of the excess ractant

answer: $19\mathrm{.}04\%$

b$)$what is the extent of reaction?

answer: $0\mathrm{.}725$

$3$mol$\%$ of the NO is converted in a second unwanted reaction as follows

$2NO+O_{2}2N{O}_2$

If $80$mol$\%$ of the ammonia fed $($described in $($Question $1)$ above$)$ is

converted

c$)$Determine the extent of reaction $1(rxn$ from ammonia to $NO$ and water$)($answer in kmol $)$

answer: $0\mathrm{.}588$

d$)$What is the extent of reaction $2($rxn from $NO$ to $N{O}_2)($answer in kmol$)$

answer: $0\mathrm{.}0352$

e$)$determine the yield of NO

f$)$Determine the selectivity of NO $($the desired product; NO$2$ is undesired$)$

I only need help in parts e and f please!!!