In what way are a mole and a dozen similar?

• A. Both are SI base units.
• B. Both are used only for counting atoms.
• C. Both represent a specific number of items.
• D. Both are units of mass.

Answer: (C)

Verified step by step guidance

1. Understand that both a mole and a dozen are counting units used to quantify a specific number of items.
2. Recall that a dozen always represents exactly 12 items, regardless of what those items are.
3. Recognize that a mole represents a much larger, fixed number of items, specifically Avogadro's number, which is approximately \$6.022 \times 10^{23}$ entities.
4. Note that neither a mole nor a dozen is an SI base unit; the mole is a base unit in the SI system for amount of substance, but a dozen is a common counting unit, not an SI unit.
5. Conclude that the similarity lies in the fact that both represent a specific, fixed number of items, making them counting units rather than units of mass or other physical quantities.