Combustion Reaction - creating equation

[Emily Nguyen 2D]

Hi!
I am a little confused on the textbook problem M.19, as I have found the molecular formula of caffeine, , but I am not sure how to create and balance the combustion reaction for this. The question states that when caffeine was burned, "..., and 0.110 g of Nitrogen were found" does this mean that N is present in the reactants or N2?

[Amber Gimino 1F]

In a combustion reaction, a species in burned in the presence of O2, and CO2 and H2O are produced. Since nitrogen is a diatomic element, it tends to be found in the form N2, and it is one of the products of this reaction.