6.023 ×[tex]10^{23}[/tex]  individual carbon atoms are there in one mole of carbon.
Mass of a 1 [tex]C_{12}[/tex] atom= 12 amu
1 amu = 1.66 ×[tex]10^{-27}[/tex] gm
∴ 12 amu =1.99 ×[tex]10^{-21}[/tex] gm
∴Mass of a 1 [tex]C_{12}[/tex] atom=1.99 ×[tex]10^{-21}[/tex] gm
Mass of C in 1 mole = 12 gm
∴Total number of atoms of carbons in 1 mole = 12 ÷ 1.99 ×[tex]10^{-21}[/tex]
∴Total number of atoms of carbons in 1 mole= 6.023 ×[tex]10^{23}[/tex]  atoms
6.023 ×[tex]10^{23}[/tex]  individual carbon atoms are there in one mole of carbon.
The number 6.023 ×[tex]10^{23}[/tex]  is known as Avogadro's number, which represents the number of individual atoms present in a one mole of substance with respect to [tex]C_{12}[/tex] atoms.
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