A mole of any substance contains how many particles?

• A. 6.02 x 10^23 particles
• B. 6.02 x 10^23 grams
• C. 12 grams
• D. 1 particle

Answer: (A)

A mole represents a specific count of particles. It’s defined as containing 6.02 × 10^23 elementary entities, a number known as Avogadro’s number. This means that a mole of any substance has that same huge count of particles, regardless of what the substance is. The mass you associate with a mole varies because different substances have different molar masses; grams per mole tell you how much mass one mole has, not how many particles there are. That’s why the correct choice is the one giving 6.02 × 10^23 particles. The other options mix mass units with particle counting, or refer to a fixed mass for a mole of carbon-12, which isn’t universally applicable to all substances, or imply just one particle.