According to this law (previously known as hypothesis), "Equal volumes of all gases, measured at the same temperature and pressure, contain equal number of molecules or moles".

$V \propto N$ (At constant temperature and pressure)

$V \propto n$ (At constant temperature and pressure)

1 gram mole (mol. Mass in grams) of all gases at NTP (STP) occupies 22.4 litres or $(22400 \times 10^{-6} m^3)$.This volume is referred as molar volume.

1 mole of any substance contains equal number of molecules which is known as Avogadro’s number and is denoted by No. and is equal to $6.023 \times 10^{23}$ .

With the help of this, number of the mass in gram of one molecule can be calculated, i.e., the mass of 1 molecule of nitrogen (mol. mass 28).

$= \dfrac{28 mol^{-1}}{6.023 \times 10^{23} mol^{-1}} = 4.649 \times 10^{-23} g$

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