# Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is:

Mole Concept -

One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g (or 0.012 kg) of the 12C isotope.

- wherein

one mole = 6.0221367 X 1023

Number of moles of Fe atom $=\frac{558.5}{55.85}=10\ Mole$

Total number of atom $=10\times 6.022\times 10^{23}=6.022 \times10^{24}$

$6.022 \times10^{24}$ no. of atoms found in 120 gm carbon.

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