Posted by Henry on Wednesday, April 27, 2011 at 4:57pm.
I do these this way.
First, I keep H and O "normal" if I can and let C change to whatever I need.
The formula becomes C3H6O2
H = +1 each x 6 = +6
O = -2 each x 2 = -4
Which means C must be -2 for three of them or -2/3 each to make the compound zero (and all compounds are zero).
Here is a very good link.
http://www.chemteam.info/Redox/Redox-Rules.html
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