In chemistry, what does a mole represent a count of?

• A. Grams of a substance
• B. Atoms, molecules, or other specified particles
• C. Energy released in a reaction
• D. Liters of a gas at STP

Answer: (B)

Verified step by step guidance

1. Understand that a mole is a fundamental unit in chemistry used to count particles, similar to how a dozen counts 12 items.
2. Recognize that a mole specifically represents a quantity of entities such as atoms, molecules, ions, or other specified particles.
3. Recall that one mole is defined as exactly \$6.022 \times 10^{23}$ of these entities, known as Avogadro's number.
4. Note that a mole does not directly represent grams, energy, or volume, but rather a count of particles regardless of their type.
5. Therefore, the mole is best understood as a counting unit for atoms, molecules, or other specified particles in a substance.