When an atom in a reactant gains electrons, what happens to its oxidation number?
a).its oxidation number decreases.
b).its oxidation number doubles.
c).its oxidation number increases.
d).its oxidation number increases by one.
e).its oxidation number stays the same.

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .