Chemistry For Engineers Practice Test

Amount of substance containing 6.022 × 10^23 particles

Mole Avogadro's number Mass Density

Correct Answer:

Mole

Explanation:

The mole concept: the amount of substance is quantified by counting particles, and one mole corresponds to 6.022 × 10^23 particles. So having exactly 6.022 × 10^23 particles means you have one mole of that substance. Mass and density describe how much material or how compact it is, but they do not specify the count of particles. Avogadro's number is the fixed count per mole (6.022 × 10^23), not the amount itself. Therefore, the unit that matches this description is the mole.

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