What is carbon's atomic mass?

Answer 1

Carbon's Atomic Mass is ~12.0107. All of those decimals at the end tell us that there is more than one isotope of carbon. If you round the number, you will find the most common isotope of carbon. (Carbon12)

IUPAC recommend in this case the expression atomic weight, not atomic mass.

The atomic weight of carbon (IUPAC Table, 2009) is [12,0096; 12,0116]. This mean that the atomic weight is variable between the above mentioned limits, depending on the type of the sample.

Answer 2

Carbon's atomic mass is approximately 12.01 atomic mass units.

Answer 3

The atomic mass of Carbon is 12 .01

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Answer 4

Carbon is a standard and has a mass of 12.

Answer 5

12.011