Haemoglobin contains 0.33% of iron by weight. The molecular weight of heamoglobin is approximately 67200. The number of iron atoms (At. Wt. of Fe=56) present in one molecule of haemoglobin is

Options

A. 1
B. 6
C. 4
D. 2

Answer

C

Explanation

`:. 0.33%` of iron by weight means 100 g of heamoglobin has 0.33 g of iron
100 g of haemoglobin contains iron =0.33 g
`:. 67200` g of haemoglobin contains iron
`=(0.33xx67200)/(100)g=221.76` g of Fe
Number of Fe- atoms `=(221.76)/(56)`
`=3.96~~4`