# Avogadro's Law

**Avogadro's Law (1811):**

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".

(At constant temperature and pressure)

(At constant temperature and pressure)

1 gram mole (mol. Mass in grams) of all gases at NTP (STP) occupies 22.4 litres or .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 .

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).

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