Asked by drew

what is the percent by mass of carbon in c3h8?

A. 18.20%
B. 20.0%
C. 81.8%
D. 85.0%

I say A
Answered by DrBob222
I don't think so.
%Carbon = (3*atomic mass C/molar mass C3H8)*100 = ?
Answered by drew
C. 81.8%
Answered by DrBob222
That's right. Now you do that other problem the same way.
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