1) Moles are a number
One mole is a number and is equal to 6x1023. The story below will help you to remember this number.
And then they made three.
6 x 1023
Summary
1 mole is a number: 6 x 1023
6 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10
Or: 600,000,000,000,000,000,000,000 (six hundred thousand million, million, million)
This amazingly big number is often referred to as Avogadro’s Constant.