can any explain me mole concept
Answers
Mole is defined as the amount of a substance, which contains the same number of chemical units (atoms, molecules, ions or electrons) as there are atoms in exactly 12 grams of pure carbon-12. A mole represents a collection of 6.023 x 1023 ( Avogadro's number) chemical units.
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Mole means a cluster of certain size of something. Suppose you are interested about 1 mole of soccer balls. By 1 mole of soccer balls, we mean a certain number of it, together. Now the total number of anything (e.g. soccer balls) in 1 mole of it has a ‘fancy’ name, which is- Avogadro’s number. The number is pretty large (huge !) , but that does not make it any difficult to understand- it’s just a number like 2,10 or 39 , only a little(!) larger. We express this number by N subscript A which is equal to 6.022*10^23.
When we talk about 1 mole of atoms, we mean 6.022*10^23 atoms. The reason the concept of mole is important is, for all elements, if you can take the mass of 1 mole of them, which means taking mass of 6.022*10^23 atoms, they will always be equal to their atomic mass expressed in grams (usually found in periodic tables).
For example, atomic mass of Oxygen is 15.99 gm. It means, if you take mass of 6.022*10^23 oxygen atoms one by (and live long enough to finish the Herculean task !) and then add them up, that will be equal to 15.99 gm.
Similarly, when we talk about 1 mole of any molecule, for example CO2, we mean 6.022*10^23 CO2 molecules.