One mole propane is combusted with air at $20\%$ excess $($use $20\%$ oxygen, $80\%$ nitrogen for air composition$).$ The $C_P=50\frac{J}{m}ol.K$ for steam, $36\frac{J}{m}ol.K$ for oxygen, $36\frac{J}{m}ol.K$ for nitrogen and $38\frac{J}{m}ol.K$ for carbon dioxde. The heat of combustion of propane is $2220k\frac{J}{m}ol.($Note combustion value in $kJ.)$

What is the adiabatic rombustion temperature?