The total sum of the masses of the atoms or elements present in the molecule is termed as molecular mass.
Calculation of Molar mass of a compound
We can find the molecular mass of the molecule by following the given substance:
- Identify the formula of the compound or molecule.
- Using the formula to determine the number of atoms present in each element of the compound or molecule.
- Multiply the atomic weight of each element with the number of atoms of that particular element.
- Similarly, do it for all the elements in the molecule or compound.
- Add up all the values obtained in the above step.
- Then add the unit as grams/mole you will get the molecular mass of the substance.
Molecular mass of glucose (C6H12O6)
Let us look for the atomic masses of carbon (C), hydrogen (H) and oxygen (O).
C = 12
H = 1
O = 16
∴ The molar mass of the glucose is
⇒ 12 x 6 + 1 x 12 + 16 x 6
⇒ 72 + 12 + 96