The mass of an atom of 12C is exactly 12 atomic mass units. Which of the following describes a mole of 12C atoms?
A) a sample that weighs exactly 12 atomic mass units
B) a sample that contains 6.02 × 1023 atoms of 12C
C) a sample that weighs exactly 12 atomic mass units and a sample that contains 6.02 x 1023 atoms of 12C
D) neither a sample that weighs exactly 12 atomic mass units or a sample that contains 6.02 x 1023 atoms of 12C
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