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Mass Percent of Carbon in Similar Compounds

APCHEM-ST1KA4

A student analyzed an unknown sample containing carbon and oxygen. She found that it contained 27.3% carbon. She thinks that she has isolated $CO$, but her friend thinks they have $CO_2$.

Which of the following compounds is the student analyzing?

A

$CO$

B

$CO_2$

C

She has a mixture of both.

D

She and her friend are both incorrect.