Quote Originally Posted by QuakeStriker View Post
4 CH3NO2 + 7 O2 = 4 CO2 + 6 H2O + 4 NO2

There you go, you just have to do it like Bekk said, make everything on the right side equal to the left side, an important rule is that you only may put numbers BEFORE the molecules. For example you want 2 of the Na groups, then you have to put it like 2Na and not Na2.
i knew that, but my teacher said "balance the Carbon first, then the Hydrogen, then the Carbon, i didnt see any Carbon on the left side the first time i saw it. thanks guys +rep!