x10²³
Mass
g
Moles
x10⁰
mol
Molecular Weight
g mol⁻¹
Number of atoms
x10²²
atoms

By Jack Bowater

This Avogadro's number calculator (also an Avogadro's constant calculator) will provide you with all your Avogadro's number needs. Want to know how many molecules are in a mole? We've got it. Need to know what is Avogadro's number? Find it here. Want to know what is the Avogadro's number definition, the Avogadro's number units, or what Avogadro's number is the number of? Read on to find out!

The Avogadro's number definition is simple really; it is the number of particles in a mole. How many particles? Exactly 6.02214085774 ×1023 mol−1. So, thanks to this calculator, you shall never wonder "Avogadro's number is the number of what?" again! The particles can be anything, molecules, atoms and radioactive ions but also things like tanks of petrol, tubes of toothpaste, cigarettes, donuts, and even pizza! As long as there is 6.02214085774 ×1023 of them.

The Avogadro's constant units may be difficult to deduce at first glance. How can such a strange concept have a unit? Let's have a look at the equation this Avogadro's number calculator uses:

`number of atoms = Avogadro's number * moles`

Now, by knowing the units of the other two variables, we can work out the Avogadro's number units:

1. For moles, the unit is simply moles.
2. The number of atoms is just a number; therefore it is dimensionless, i.e., it does not any units.
3. Rearrange the formula to find Avogadro's constant: `number of atoms / moles = Avogadro's number`
4. So on the left-hand side, we have `no units / moles`, which can be expressed as mol-1.
5. As the left-hand side equals the right-hand side, the Avogadro's number units is mol-1.

There you go, the units of Avogadro's number is mol-1. Remember that you can always find the units of something if you know an equation with it in and the units of the rest of the variables!