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the Avogadro constant (symbols: L, NA) is the number of constituent particles, usually atoms or molecules, that are contained in the amount of substance given by one mole
Avogadro's constant has the value 6.()× mol−1
when you have1 mole of H2O = g of water =6. * molecules
and1 mole of ammoina NH3 = g = 6. * molecules too
Simply it's the number of atoms or molecules in1 mol of the substance. For example1 mole of carbon contains6.*^ carbon atoms. And1 mole of Lysine contains6.*^ Lysine molecules and so on...
