Question

what is mole concept?who introduced it & how it's calculated?

Answer 1

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Mole concept:
assume that we have to calculate a large amount, let's say you are working in a bank and you have to calculate a lot of coins. instead counting them one by one, you have an option that you can separate ₹1 coins and then weigh them.

Let's say 200 coins of ₹1 weigh 900g.

and now from here, you can calculate no. of coins for a particular amount of coins.

similarly, there are a lot of atoms in a given material and however it's impossible to calculate the exact amount.

Wilhelm Ostwald, introducer of mole concept, said that 1 mole of a substance contains as many particles as are there in it's GAM.

let's say the mass of carbon is 12. now 12 gram of carbon = 1 mole

1 mole contains fixed no. of atoms ( as there are fixed no. of objects in 1 dozen), this no. is often called Avogadro's constant or Avogadro's number= 6.022×10²³ particles( atoms, molecules, ions)


for doing all related questions you just have to know three relations.

gram atomic/ molecular mass= 6.022×10²³ particles

gram atomic mass = 1 mole

and, 1 mole = 6.022×10²³


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