There seems to be an error in the chemical equation provided. To complete the reaction sequence, I will assume that the intended reaction is the combustion of carbon $C$ in the presence of excess oxygen $O2$ to form carbon dioxide $CO2$ and release energy.

Therefore, the complete reaction sequence is as follows:

NaOH + C → HNO3 + CHNO3 + C → H2O + CH2O $900°C$ + C → H2O + CF + C → CO2 + C

The final product of the reaction sequence is carbon dioxide $CO2$.