Acetylene gas $($C$2$H$2)$ at $25$C is burned completely during a steady$-$flow

combustion process with $50$ percent excess air that enters the combustion chamber at $37$C$.$ If

the products leave at $1300$ K$,$ determine $($a$)$ the air$$fuel ratio and $($b$)$ the heat transfer per kg$-$

mole of fuel during this process.