Calculating molecular weights

The molecular weight Mw of a molecule can be found by adding the atomic weights of all the atoms that molecule is made of. Let’s take Sulfuric Acid as an example. The formula of Sulfuric Acid is H2SO4. To calculate the molecular weight we take:

Just like the atomic mass in amu corresponds to the molar mass of that atom in grams, so the molecular weight of one molecule in amu corresponds to the molar mass in g/mol.