Problem $16\mathrm{.}057-$ Liquid propane burning in excess air with temperature difference

Liquid propane $(C_3{H}_8)$ enters a combustion chamber at $25C$ at a rate of $1\mathrm{.}000k\frac{g}{m}in$ where it is mixed and burned with $150$ percent excess air that enters the combustion chamber at $12C.$ The combustion is complete and the exit temperature of the combustion gases is $1,200K.$ Use data from the tables. Take the enthalpy of formation for LIQUID propane $(\frac{?}{\text{b}\text{a}\text{r}}(h{)}_f^o)=118910k\frac{J}{k}$mol.

Problem $16\mathrm{.}057.$a $-$ Mass flow rate for the air

Determine the mass flow rate of air.

The mass flow rate of air is $k\frac{g}{m}in.$