What is Mole? Atoms and molecules are too small to count. To solve this problem their numbers are expressed in terms of Avogadro’s number (N A = 6.023 10 23 ). Mole is the number equal to Avogadro’s number just like a dozen is equal to 12, a century means 100, a score means = 20. Mole can be defined as a unit which represents 6.023 x10 23 particles of same matter. A mole (symbol mol) is defined as the amount of substance that contains as many atoms, molecules, ions, electrons or any other elementary entities as there are carbon atoms in exactly 12 gm of . The number of atoms in 12 gm of is called Avogadro’s number . One atomic mass unit (amu) The number of moles of a substance can be calculated by various means depending on data available, as follows. Number of moles of molecules Number of moles of atoms Number of moles of gases (Standard molar volume at STP = 22.4 lit) Number of moles of particles e...
