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  4. Number of atoms in 560 g of Fe (atomic mass 56 g mol -1 ) is:

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Q. Number of atoms in $560 g$ of Fe (atomic mass $56 g mol ^{-1}$ ) is:

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Solution:

$560 g$ of $Fe$

No. of moles $=\frac{560 g }{56 g }=10 mole $

$70 g$ of $N$

$14 g =1 mole $ of $N $

$70 g =5 moles $ of $ N$

$20 g H =20 moles$ of $H$ -atoms