Amount of substance
- In thermodynamics, the amount of substance is an SI base quantity with the base unit mol
- The mole is a unit of substance, not a unit of mass
- The mole is defined as:
An amount containing as many particles (e.g. atoms or molecules) as there are atoms in 12 g of carbon-12
- If we consider the number of moles of two different gases under the same conditions, their physical properties are the same
- The number of moles, n can be calculated using the equation
- Where:
- N = number of molecules
- NA = Avogadro's constant