# What is the SI unit used to measure amount of substance?

Jan 10, 2017

The amount of a substance, ie., the number of moles there is, is measured in $\text{mol}$.

#### Explanation:

$1$ $\text{mol}$ of a substance is the amount of that substance which contains the same number of particles as $12$ $\text{g}$ of carbon$- 12$.

For solids, the number of moles can found using the following formula:

$\text{moles" = "mass"/"molar mass}$

For liquids, the number of moles can found using the following formula:

$\text{moles" = "conc." xx "vol.}$

For gases, $1$ $\text{mol}$ occupies $24$ ${\text{dm}}^{3}$ at $278$ $\text{K}$ and $1$ $\text{atm}$ of pressure.