Problem: What is the mass (in amu) of a carbon-12 atom? Why is the atomic mass of carbon listed as 12.01 amu?

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We're being asked to determine the mass (in amu) of a carbon-12 atom and why is the atomic mass of carbon listed as 12.01 amu.

The atom of the carbon-12 isotope of carbon has a mass of exactly 12 amu  (atomic mass unit)

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What is the mass (in amu) of a carbon-12 atom? Why is the atomic mass of carbon listed as 12.01 amu?

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