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

Mass of iron in 100 g haemoglobin=0.334 g
`:.` In 67200 g haemoglobin, mass of iron
`=(842)/(6.023 xx 10^(23))=1.4 xx 10^(-21) g`
`:.` The number of Fe atoms in one molecule of haemoglobin
`=(672 xx 0.334)/(56)= 4`