(Solved): 4. Consider complete combustion of 1kmol of pentane gas (C5H12) with 40% excess air (both at ...

4. Consider complete combustion of $1\mathrm{kmol}$ of pentane gas $\left({\mathrm{C}}_5{\mathrm{H}}_{12}\right)$ with $40\%$ excess air (both at 25 ${}^{?}\mathrm{C}$ and $1\mathrm{atm}$.) The process happens at steady state. Combustion products exit at $500\mathrm{K}$. Write the balanced reaction and determine the air-fuel ratio and the heat transfer (in $\mathrm{kJ}/\mathrm{kmol}$ of fuel) during this process. Water in products is in gas form. Answers: $\mathrm{AF}=21.43$ and ${\mathrm{Q}}_{\mathbf{O}}$ out $=2920530\mathrm{kJ}/\mathrm{kmol}$