* Formula weight is the sum of the atomic weights of all the atoms in a chemical formula, expressed in atomic mass units (amu).
* Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol).
Here's the key connection:
* 1 amu is equal to 1 g/mol.
Therefore:
* The numerical value of the formula weight and molar mass is identical.
* The difference is only in the units used.
Example:
* The formula weight of water (H₂O) is 18 amu (1 + 1 + 16 = 18).
* The molar mass of water is 18 g/mol.
So, you can use the terms formula weight and molar mass interchangeably as long as you are aware of the units being used.
