The Mass of an Atom of ¹²C Is Exactly 12

question 46

Multiple Choice

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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