At $T=300K,$ the heat of mixing data for a binary liquid mixture of octanol

and decane at atmospheric pressure is approximately fit by:

${}_{\text{m}\text{i}\text{x}}{H}_{?}=A{x}_1{x}_2$

where $A=2478\frac{J}{m}ol.$ Pure octanol and pure decane are flowed continuously into an

isothermal mixer in a $1$:$1$ mole ratio at $300K.$ What will be the heat flow per mole of

solution leaving the mixer?