Haemoglobin contains 0.33% of iron by weight. The molecular weight of

1.	Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (At. wt. of Fe = 56) present in one molecule of haemoglobin is _____.(A) 1 (B) 2 (C) 4 (D) 6
Answer» Correct option: (C) 4 100 g of haemoglobin contains 0.33 g of Fe ∴ 67200 g of haemoglobin contains \(\cfrac{67200\, \times\, 0.33}{100}\) = 221.76 g of Fe. Number of atoms of Fe = \(\cfrac{221.76}{56}\) = 3.96 ≈ 4

Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (At. wt. of Fe = 56) present in one molecule of haemoglobin is _____.(A) 1 (B) 2 (C) 4 (D) 6

Answer»

Correct option: (C) 4

100 g of haemoglobin contains 0.33 g of Fe

∴ 67200 g of haemoglobin contains

\(\cfrac{67200\, \times\, 0.33}{100}\)

= 221.76 g of Fe.

Number of atoms of Fe = \(\cfrac{221.76}{56}\)

= 3.96 ≈ 4