Haemoglobin contains 0.25% iron by weight. The molecular wt. of haemoglobin is 89600. The no. of iron atoms per molecule is (At. wt. of iron = 55.84)

Options

A. 4
B. 2
C. 6
D. 8

Answer

A

Explanation

100 g Haemoglobn has `=0.25 g Fe`
`therefore 89600` g Haemoglobin has `= (0. 25 xx 89 600)/(100) g Fe = 224 g Fe`
ie., 1 mole of N molecules of Haemoglobin has `= (224)/(56) g` atom `Fe = 4` atom Fe
`therefore ` 1 molecule of Haemoglobin has 4 atom of Fe.