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Which of the following equals one atomic mass unit?

one-twelfth the mass of one carbon-12 atom
the mass of one electron
one-sixth the mass of one helium-4 atom
the mass of one carbon-12 atom

Correct Answer: one-twelfth the mass of one carbon-12 atom

Explanation:

One atomic mass unit (AMU) is equal to the one-twelfth the mass of one carbon-12 atom.

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