Question

difference between molecular mass formula unit mass.

Answer 1

Only one difference is found in the two masses, as actually molecular mass is the mass of one unit of a molecule (molar mass) of covalent compounds while for ionic compounds mass of one molecule unit is called formula unit mass because, ionic compounds have no overlapping rather the ions are separated but remain attached due to electrostatic force of attractions and so they are considered to be formula unit and so their mass is formula unit mass.