Which is the product of that reaction

What’s the percent by mass of carbon in c10h14n2

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together