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The g flag at the end of the substitute command shouldn't have any effect, but your three counts should have been added to the end of line 7 in the file named input.
Saying it doesn't work, without...

As has been said many times before on these forums, shell variables are not expanded inside single quotes. Try changing:
sed -i '7,7 s/$/ $count_C $count_O $count_H/g' inputto:
sed -i...