please finish this with all the process

An industrial burner is used to combust n-butane and operates with 20% excess oxygen. a. If the temperature in the burner reaches only 80% of its maximum temperature, what is the change in enthalpy associated with the reaction? b. Compare the value you have calculated for H and compare it with the H associated with the adiabatic flame temperature. In the context of the physical experiment, what does it represent, i.e. what does it tell you about what is happening during the combustion in this burner