Question

A compound has Haemoglobin like structure which has 1 Fe atom. It contains 4.6% Fe. Calculate the approximate molar mass.

Answer 1

Iron Fe has an atomic mass of 55.845 u  (Z=26).

Let the molecular mass of Haemoglobin = m  u

55.845 /m  * 100 = 4.6 
=> m = 1, 214 u
or molar mass =  1, 214 g/mole

Answer 2

Answer:

The approximate molar mass of hemoglobin is 1,214.13 g/mol.

Explanation:

Number of atoms of iron in hemoglobin = 1

Mass of 1 iron atom = 55.85 g/mol

Percentage of iron in 1 hemoglobin molecule = 4.6 %

Molar mass of hemoglobin = x

$4.6=\frac{55.85 g/mol}{x}\times 100$

x = 1,214.13 g/mol

The approximate molar mass of hemoglobin is 1,214.13 g/mol.