Where the NO came from?

[haisol]

Hello~

I had an experiment, and it was calorimeter measurement.

We used bomb calorimeter to measure the energy equivalent of benzoic acid(C6H5COOH).

We put the benzoic acid pallet into oxygen bomb with 15bar of oxygen.

But, my TA said that NO(nitrogen monoxide) will be produced, and we should find out

where it came from, but I have no idea.

Oxygen bomb was isolated from the air, and there's no nitrogen... where it came from?

Thank you!

[QuarkCharmer]

That is strange, the NO could not have been created from nothing. How was the bomb constructed, and are you sure it was just benzoic acid and pure oxygen? Any chance he meant Carbon Monoxide?