Question

Number of atoms in 100 grams of haemoglobin if it contains 0.33 percentage of fb

Answer 1

 Mass of Haemoglobin =100 g. 
Mass of iron atoms = (0.33/100) x 100 =0.33 g
56 g of iron contains = 1 mole of Iron or 6.023 x 1023 atoms. 
0.33 g of iron contains = (0.33 x 6.023 x 1023)/56 = 3.5492 x1021 atoms of Fe.