Question $(4)$: $(5$ Points$)$

The composition of fuel gas is $($vol$.\%)$; carbon dioxide $3,$ carbon monoxide $12,$ hydrogen $12,$ methane $40,$ ethanol $17,$ propylene $13,$ balance nitrogen. If this gas is burnt in a furnace with $20\%$ excess air. Assuming complete combustion, calculate for $100$kmol$\frac{e}{h}$ of fuel:

a$)$ Molar and standard volumetric flowrate of air required

b$)$ Total molar and volumetric flowrate of flue gas produced after they are cooled to $150C$

Assume any required data