The Mass of an Atom of ¹²C Is Exactly 12

question 37

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 which weighs exactly 12 atomic mass units
• B) a sample which contains 6.02 × 10²³ atoms of ¹²C
• C) both a and b
• D) neither a nor b

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