Haemoglobin contains 0.25 % iron by mass. The molecular mass of haemoglobin is 89600. Calculate the number of iron atoms per molecule of haemoglobin.

Haemoglobin contains 0.25 % iron by mass. The molecular mass of haemog

1.	Haemoglobin contains 0.25 % iron by mass. The molecular mass of haemoglobin is 89600. Calculate the number of iron atoms per molecule of haemoglobin.
Answer» Solution :100 g of haemoglobin has IRON = 0.25 g 89600 g of haemoglobin has iron `= (0.25g)xx((89600g))/((100g))=224g` No. of gram atoms of iron (FE) `= ((224g))/((56g))=4g` atom Thus, 1 gram mole of haemoglobin has Fe atoms = 4g atom `:.` 1 molecule of haemoglobin has Fe atoms = 4.