Oxidation Numbers

EXAMPLE:  Find the oxidation number of carbon (C) in Na2CO3.

            ~ Let x = oxidation # of carbon
            ~ Na’s oxid. # is +1
            ~ O’s oxid. # is -2
            ~ sum of (# of each element in cmpd. multiplied by its oxid. #) = 0
            ~ 2 (+1) + 1 (x) + 3 (-2) = 0
                Na            C          O
            ~ 2 + x – 6 = 0
            ~ x – 4 = 0
            ~ x = +4 (Carbon’s oxidation number in Na2CO3 is +4.)

Find the oxidation number of the underlined element in each compound.

1.  KMnO4

2.  LiNO3

3.  NaClO

4.  MnO2

5.  Ca(NO2)2

6.  Ba(ClO4)2

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