chemistry

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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

• chemistry -

I don't think so.
%Carbon = (3*atomic mass C/molar mass C3H8)*100 = ?

• chemistry -

C. 81.8%

• chemistry -

That's right. Now you do that other problem the same way.

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