Introduction to Avogadro's Law
At the same temperature and pressure, 1 mole of any gas occupies the same volume. In the standard state of T0 = 273.15K and p0 = 1 atmospheric pressure, the volume occupied by 1 mole of any gas is V0 = 22.41410 × 10-3 m 3 / mol (m3 · mol-1). It can also be expressed as: at the same temperature and pressure, the number of molecules (or moles) of any gas of the same volume is equal. In the standard state, the number of molecules per unit volume of gas, that is, J. Roxmide constant is n0 = 2.686773 × 1025m-3, so the number of molecules contained in 1 mole of gas is
NA = 6.0221367 × 10 ^ 23 mol-1 is called Avogadro's constant. According to Moore's definition, the basic unit of a material system can be atoms, molecules, or ions, electrons, other particles, or a specific combination of these particles. Therefore, Avogadro's law can also be generalized as the number of basic units contained in 1 mole of any substance is equal to Avogadro's constant.