Question

How do I get the molar mass of urea?

Answer 1

Hint: The addition of the individual atomic or molecular weights of the elements which are present in the molecular or chemical formula is called molar mass or molecular weight. We have to consider each and every element at the time of calculation of the molar mass of a chemical.
Complete step by step answer:
- In the question it is asked how we can calculate the molar mass of the urea.
- To calculate the molar mass of urea we should know the molecular formula of urea.
- The molecular formula of urea is $N{{H}_{2}}CON{{H}_{2}}$ .
 - To calculate the molar mass of any chemical first we should know the molecular weight of the individual elements which are present in the given compound.
- The individual elements which are present in the chemical formula of urea are carbon, hydrogen, oxygen and nitrogen.
- The molecular weights of hydrogen, carbon, nitrogen and oxygen are 1, 12, 14 and 16 respectively.
- Therefore the molecular weight of the urea can be calculated very easily and it is as follows.
4 (H) + 2 (N) + (O) + (C) = 4 (1) + 2(14) + (16) + (12) = 4 + 28 + 16 + 12 = 60.
Therefore the molecular mass of the urea is 60.
Note: Equivalent weight is different from the molecular weight of the substance. The equivalent weight of a chemical is going to depend on the acidity or basicity of the atoms in the given molecule. We have to consider all the elements' atomic weights at the time of calculation of the molecular weight of the compound.