$5\mathrm{.}2$ Terminology for Reaction Systems

Problem

Two well$-$known gas phase reactions take place in the dehydration of ethane:

$C_2{H}_3{C}_2{H}_2+H_2$

$C_2{H}_6+H_{2}2C{H}_4$

$($a$)$

$($b$)$

Given the product distribution measured in the gas phase reaction of $C_2{H}_6$ as follows:

a$.$ What species was the limiting reactant?

b$.$ What species was the excess reactant?

c$.$ What was the conversion of $($:$C_2{H}_6$