A mole contains Avogadro's number of particles.
Which is heavier, a mole of carbon or a mole of lead?
Excuse me, could you help me figure this out? How many moles of this reagent should I add to get the concentration I need?
Aldrich Ames, the spy, was a mole in the CIA, burrowed underground in that organization like a mole under the lawn. Don't make a mountain out of a molehill!