What is the oxidation number or

oxidation state for each of the atoms in the following substances?

What I want to do is look at those elements for

which I know the oxidation state and use the information I

know about them to solve for the oxidation number of the unknown atom.

In this case, I know that hydrogen has an oxidation number of plus 1 and

oxygen is minus 2.

For the moment, I'm going to say N has an oxidation number of x.

So I can say plus 1 from the hydrogen, plus x for

the nitrogen, plus 3 times minus 2 for the oxygen.

And I know that the sum of those values must be equal to 0 because this is

a neutral compound.

So I have 1 plus x minus 6 equals 0.

So I have x minus 5 equals 0.

So x equals 5.

So I'm able to determine that the oxidation state of nitrogen is plus 5.