Question

calculate the number of iron atom in a piece of iron waiting 2.8 gram .​

Answer 1

Answer:

1 mole of iron=Gram atomic mass of iron

We know that 1 mole of iron element contains 6.022×10^23

Now,56 g of iron=6.022,×10^23/56×2.8

=3.011×10^22

Answer 2

Weight of iron atom = 2.8gram

1 mole of iron atom contain = avagardo constant = 6.022*10^23

Number of mole ,= Given mass/molecular mass

Number of mole = 2.8/56= 1/20

Number of iron atom = (6 .022 *10^23) /20

$number \: of \:iron \: atom \: = 3.011 \times {10}^{22}$