Q. 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) 6
B) 1
C) 4
D) 2
Explanation
(c)
In 100 g haemoglobin, mass of iron = 0.33 g
$\therefore$ in 67200 g haemoglobin, mass of iron $= \frac{67200 \times 0.33}{100}$
$\therefore$ the number of Fe atoms in one Hb molecule
$= \frac{672 \times 0.33}{56}$
$= 4$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.