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Definition of the Mole

Mole is defined as the amount of substance that contains Avogadro number of particles. The Avogadro number is 6.02 × 1023 (or 602 000 000 000 000 000 000 000). SI symbol is mol.

Definition of Avogadro Number

The number of atoms in 12 g of the C-12 isotope.
The mass of one mole of atoms is its relative atomic mass in grams.
The mass of one mole of molecules is its relative molecular mass in grams.

Avogadro’s Law and Molar Gas Volumes

Equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules.
Under normal conditions of temperature and pressure (0°C or 273 K and 1 atmosphere or 760 mm Hg), also known as NTP conditions, one gram mole (or molar mass) of a gas or vapour occupies a volume of 22.4 L. This is known as molar volume.
In all chemical calculations, gas volumes will be measured at room temperature and pressure (STP). Room temperature is taken as 25°C (298 K) and room pressure as one atmosphere (760 mm Hg).

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