Answer: A property closely related to an atom's mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.
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It produces nitrogen gas and water
4NH3+3O2+heat 2N2+6H 2O
Use photomath. I would really recommend it! Hope this helps!