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One atomic mass unit is defined as exactly:
AMass of one hydrogen atom
B1/16 mass of an O-16 atom
C1/12 mass of a C-12 atom
DMass of one free proton
Answer & Solution
Correct answer: C. 1/12 mass of a C-12 atom
The atomic mass unit is set as one-twelfth of the mass of a single carbon-12 atom.
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