**Assertion (A):** One atomic mass unit is defined as th of the mass of one carbon-12 atom. <br>**Re — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
**Assertion (A):** One atomic mass unit is defined as $1/12$th of the mass of one carbon-12 atom. <br>**Reason (R):** Carbon-12 is the standard chosen by IUPAC for atomic mass scale.
Answer: A
💡 Solution & Explanation
Carbon-12 was chosen as the reference because of its abundance and stability. The definition of $1 \text{ amu}$ (or $1 \text{ u}$) is exactly $1/12$th of its mass. [1, 11]
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