One a. m .u stands for
Correct answer: B. 1/12th of a carbon
- A. An atom of C - 12
- B. 1/12th of a carbon
- C. 1/12th of H
- D. 1 atom of all the elements
Explanation
The atomic mass unit (amu) is a unit of mass used to express the mass of atomic and subatomic particles. It is defined as 1/12th of the mass of a carbon-12 atom. Carbon-12 is specifically chosen as the reference because it has a mass of exactly 12 atomic mass units.
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The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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