What is a mole? September 24, 2024 by Admin 1 mole of a substance is the atomic or molecular mass of that substance that is expressed in grams. Related Posts:Atom Definition, What is atom? How big is an atom?What is relativity of mass?What is the law of triads?Lessons on LifeInertia and Concept of Force - Newton's First LawWhat is heat of combustion?