Question

The relative atomic mass of an element has no unit.

• A. True
• B. False

Answer 1

The correct option is A True

1. Atomic mass is the mass of an atom.
2. Relative atomic mass is a dimensionless physical quantity.
3. It is the ratio of the average mass of atoms of an element (from a single given sample or source) to 1/12 th of the mass of an atom of carbon-12 (known as the unified atomic mass unit).
4. $\mathrm{Relative}\mathrm{atomic}\mathrm{mass}=\frac{\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{given}\mathrm{substance}}{\mathrm{Mass}\mathrm{of}1/12\mathrm{th}\mathrm{of}\mathrm{C}-12\mathrm{atom}}$.
5. The relative atomic mass of an element has no unit because it is a ratio of the masses.
6. Hence the given statement is true.