Question

What is the molar mass of the hemoglobin?

Answer 1

Hint: The molar mass of a substance is nothing but the mass of the chemical which is present in the given sample and which is going to be expressed in gram/mole in CGS system or kg/mol in SI system.

Complete answer:
- In the question it is given to find the molar mass of the hemoglobin.
- We know that hemoglobin is not a simple molecule, it is highly complex in nature.
- We should know the molecular formula or chemical formula of the compound to find the molar mass of the particular substance.
- The chemical formula of hemoglobin is $C_{2932}{H}_{4724}{N}_{828}{O}_{840}{S}_{8}F{e}_4$ .
- Means hemoglobin contains 2932 atoms of carbon, 4724 hydrogen atoms, 828 atoms of nitrogen, 840 atoms of oxygen. 8 atoms of sulphur and 4 atoms of iron (Fe).
- By seeing the number of atoms itself we can say that hemoglobin is very complex in nature.
- The molecular weight of the hemoglobin is going to be found by multiplying the number of atoms with respective atomic weights and we have to sum those atomic weights of all the individual atoms.
- Therefore from the molecular formula $C_{2932}{H}_{4724}{N}_{828}{O}_{840}{S}_{8}F{e}_4$ we will get a molecular weight of 65000.
- We know that molar mass should be expressed in gram/mol.
- Therefore the molar mass of the hemoglobin is nearly 65000 g/mol (65495 g/mol).

Note:
We have to include the atomic weight of the individual elements involved in the complex molecule to get the exact molecular weight of the total complex compound. Even a number of hydrogens are also included.