1. The problem statement, all variables and given/known data What is the percentage of carbon in dimethylsulfoxide, C2 H6 SO4? 2. Relevant equations mass of C / total mass x 100 = percentage of carbon 3. The attempt at a solution The total mass = 126 total mass of C = 24 Wouldn't it be 24 / 126 x 100 = 19 % But somehow I got this wrong, it's 30.7 % Any help will be appreciated, thanks a lot
No, if you are happy that the chemical formula you have given is correct, the maths is also correct. However, see e.g. http://en.wikipedia.org/w/index.php?title=Dimethyl_sulfoxide&oldid=399297621 or similar.