Three hundred L$/$h of a $35\mathrm{.}0$ mole $\%C_3{H}_8-65\mathrm{.}0\%n-C_4{H}_{10}$ mixture at $0C$ and $1\mathrm{.}10$ atm and

$300\mathrm{.}0\frac{L}{h}$ of a $45\mathrm{.}0$ mole $\%C_3{H}_8-55\mathrm{.}0\%n-C_4{H}_{10}$ mixture at $25C$ and $1\mathrm{.}10$atm are mixed and

heated to $227C$ at constant pressure.

Enthalpies of propane and $n-$butane are listed below. Assume ideal$-$gas behavior.

Calculate the heat requirement.