Atomic mass is measured in which of the following units?

• A. gram per mole (g/mol)
• B. atomic mass unit (amu)
• C. liter (L)
• D. kilogram (kg)

Answer: (B)

Verified step by step guidance

1. Understand that atomic mass refers to the mass of a single atom, typically expressed relative to a standard.
2. Recall that the atomic mass unit (amu) is defined as one twelfth the mass of a carbon-12 atom, making it a convenient unit for expressing atomic and molecular masses.
3. Recognize that gram per mole (g/mol) is a unit used for molar mass, which relates to the mass of one mole of atoms or molecules, not a single atom.
4. Note that liter (L) is a unit of volume, and kilogram (kg) is a larger unit of mass used for macroscopic quantities, not for atomic scale masses.
5. Conclude that the correct unit for atomic mass is the atomic mass unit (amu), as it directly measures the mass of individual atoms.