Enter the total number of grams of the substance and the molecular weight into the calculator to determine the total number of moles.

## Mol Formula

The following formula is used to calculate the total number of moles of a substance.

m = M / mw

- Where m is the number of moles
- M is the mass (grams)
- mw is the molecular weight (grams/mole)

## Mol Definition

A mole is a unitless measure that describes the number of atoms in a particular amount of substance.

## Mol Example

How to calculate the number of moles?

**First, determine the mass.**Measure the total mass of the substance.

**Next, determine the molecular mass.**Calculate the molecular mass.

**Finally, calculate the number of moles.**Calculate the number of moles using the equation above.

## FAQ

**What is a mole?**

A mole is a unitless measure that describes a certain number of atoms in a substance. To calculate the number of moles from atoms, navigate to the calculator linked above.

**What is molecular weight?**

Molecular weight is a measurement that is similar to density. Instead of mass per unit volume, its a mass per mole.

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