Question

Haemoglobin contains $0.35\%Fe.$ Each haemoglobin unit contains four atoms of $Fe\left(56\text{g/mol}\right).$ The molar weight of haemoglobin (in kg) is:

Answer 1

Given,
One mole of haemoglobin contains 4 moles of $Fe$ atoms.

Weight of $Fe$ in one mole of haemoglobin = $4\times 56\text{g}$ $=224\text{g},$ which is $0.35\%$ of the molecular weight of the protein.

Therefore, the molar weight of Haemoglobin is:
$=\frac{224\text{g/mol}}{0.0035}$
$=64\times {10}^3\text{g/mol}=64\text{kg/mol}$