EXERCISE No $4($Textbook$,$ problem $5\mathrm{.}28,$ page $205)30$ points: What is the entropy

change of the gas, heated in a steady$-$flow process at approximately atmospheric pressure

when $2500$ kJ$/$hr of heat is added to $15$ mol$/$hr of $1-$butene initially at $260\backslash$deg C$?$