Question

If one molecule of haemoglobin contains \[4\] iron atoms, and they constitute \[0.335\% \] by mass haemoglobin, what is the molar mass of haemoglobin?

Answer 1

Hint: The periodic table plays a vital role in science. In the periodic table, there are a total of \[118\] elements. The periodic table consists of \[18\] columns and \[7\] rows. The columns are called groups. Hence, \[18\] groups in the periodic table. The rows are called periods. Hence, a total of \[7\] period is in the table. In the periodic table, Iron is one of the metallic elements. The symbol of iron is derived from the Latin form Ferrum. Iron is the fourth most common element in the earth’s crust in the elemental list. The appearance of the iron is lustrous metallic with greyish colour.

Complete answer:
Every element in the periodic table has a certain group and period. In that case, one of the elements in the period is iron. The atomic number of iron is \[26\] and the symbol is \[{\text{Fe}}\] . The mass number of the iron is\[55.845\] .
The number of iron atoms in haemoglobin is four.
The total mass of iron in haemoglobin is calculated,
\[
   = 4 \times 55.845 \\
   = 223.4 \\
 \]
The total mass of iron in haemoglobin is \[223.4\] .
The molar mass of the haemoglobin is considered as M.
There are \[4\] iron atoms in haemoglobin and they are constituted\[0.335\% \] by mass haemoglobin.
The molar mass of the haemoglobin is calculated as
\[\dfrac{{223.4}}{M} \times 100 = 0.335\]
\[\dfrac{{22340}}{M} = 0.335\]
\[\dfrac{{22340}}{{0.335}} = M\]
\[M = 66686{\text{ }}g\]
According to the above discussion, we conclude if one molecule of haemoglobin contains \[4\] iron atoms, and they are constituted\[0.335\% \] by mass haemoglobin, the molar mass of haemoglobin is \[66686{\text{ }}g\] .

Note:
Iron plays a vital role in industrial development. In our body also iron plays a vital role through haemoglobin in the blood. Lack of iron in the human body is known as anaemia. The atomic number of the element is nothing but the number of electrons or the number of protons. The mass number of the atom means the sum of the number of protons and the number of neutrons. The Iron atom is one of the transition metals in the period. The nature of the iron atom is metallic solid.