Question

The hemoglobin from the red blood corpuscles of most mammals contains approximately $0.33$% of iron by mass.The molar mass of hemoglobin as $67,200$.The number of iron atoms in each molecule of hemoglobin is (atomic mass of iron =$56$) :

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

The correct option is C 4

Given,
$100$ g sample $\equiv$ $0.33$ g iron
$\therefore 67200g\equiv 221.8giron$
As atomic mass of iron is $56$, so, number of atoms of iron in one mole of hemoglobin$=\frac{221.8}{56}=4$