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Define Avogadro constant (N(A))....

Define Avogadro constant `(N_(A))`.

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To count elementary particle number of atoms in 12 g of carbon -12 isotopes is taken as standard the number has been experimentally found to be `6.023 xx 10^(23)` and is called one mole. This number is also known as Avogadro's number or Avogadro, constant..
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