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Percent Composition

by priscilla89
Tags: composition, percent
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priscilla89
#1
Dec24-10, 10:23 AM
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
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sjb-2812
#2
Dec24-10, 10:33 AM
P: 427
Quote Quote by priscilla89 View Post
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?
priscilla89
#3
Dec24-10, 10:49 AM
P: 18
Quote Quote by sjb-2812 View Post
Are you sure of your formula for dimethyl sulfoxide?
Yes, but I think somehow it's the formula that's wrong.

sjb-2812
#4
Dec24-10, 10:56 AM
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.
priscilla89
#5
Dec24-10, 11:06 AM
P: 18
Quote Quote by sjb-2812 View Post
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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