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# Amount of Substance Calculation

To find the amount of substance, input mass, molar mass, and press calculate button

## Formula

**Amount of substance (n) = Mass (m)/Molar mass (M)**

## What is the amount of substance?

The amount of Substance is also called as material quantity. The amount of substance refers to a standards-defined quantity that measures the size of an ensemble of elementary entities, such as atoms, molecules, electrons, and other particles.

The amount of substance appears in thermodynamic relations such as the ideal gas law, and in stoichiometric relations between reacting molecules as in the law of multiple proportions. The unit symbol of the amount of substance is the mole.

The mole is defined as the amount of substance that contains an equal number of elementary entities as there are atoms in 0.012kg of the isotope carbon-12. One mole is equal to approximately 6.022169 x 10^{23} and is also called the Avogadro constant.

## How to find the amount of substance?

**Example:**

Calculate the amount of substance when the mass and molar mass of substance is known.

Mass (kg) = 25

Molar Mass (g/mol) = 20

**Solution:**

**Apply Formula:**

Amount of substance (n) = Mass (m)/Molar mass (M)

Amount of Substance (n) = 25/20

**Amount of Substance (n) = 1.25 mole**