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mole concept all formulas call 9

Answer 1

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 Mole concept – The word mole was introduced by Wilhelm Ostwald. In Latin, mole means heap or collection or pile.

- A mole is defined as the amount of a substance that contains as many particles (atoms, molecules or ions) of the substance as there are atoms in exactly 12 g of carbon-12.

- The number of particles present in a mole of any substance is fixed, with a value of 6.022 x 1023. This number is called Avogadro number or Avogadro constant, named in honour of the Italian scientist Amedeo Avogadro. It is represented by N0.

- In other words, a mole of a substance is that amount of the substance that contains 6.022 x 1023particles of the substance.

- Mole is the SI unit of amount of substance.

- The atomic mass of an element expressed in grams is called gram atomic mass of the element. 

- The molecular mass of a substance expressed in grams is called gram molecular mass of the substance.

- Gram atomic mass or gram molecular mass also represents molar mass of the substance.

- The mass of 1 mole of a substance is called molar mass of the substance.

1 mole = 6.022 x 1023 particles = Gram atomic mass (or gram molecular mass)

 

 

 

 

 

§ Some important formulae –

(i.) n = m

 M

(ii.) n = N

 N0

(iii.) m = M x n

(iv.) m = M x N

N0

(v.) N = n x N0

(vi.) N = m x N0

 M

 n = number of moles

 m = given mass

 M = molar mass

 N = given number of particles

 N0 = Avogadro number