Define "mole."

Expert Answers

An illustration of the letter 'A' in a speech bubbles

A Mole is merely a number.  It's a number, by definition, that contains 6.02 x 10^23 things.  So, instead of saying we have a billion of something or ten billion, or a sextillion of something, we say we have a Mole, or 6 followed by 23 zeros.

This is a fantastically large number, but atoms and molecules are fantastically small, so the Mole is a convenient unit of counting particles.  By definition, a Mole of a gas will occupy exactly 22.4 liters.  Moles are also used in calculating the molecular weight of a given quantity of a substance.  By knowing the weight, we can calculate the number of particles.

See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial