Percent Composition

by priscilla89
Tags: composition, percent
 P: 18 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
P: 427
 Quote by priscilla89 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
Are you sure of your formula for dimethyl sulfoxide?
P: 18
 Quote by sjb-2812 Are you sure of your formula for dimethyl sulfoxide?
Yes, but I think somehow it's the formula that's wrong.

 P: 427 Percent Composition 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?...ldid=399297621 or similar.
P: 18
 Quote by sjb-2812 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?...ldid=399297621 or similar.
But the formula has to be (CH3)2 SO.

24 / 78 x 100 = 30.7 %

- thanks a lot and happy holidays

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