Difference between molar mass and atomic mass
The molar mass of a compound tells you the mass of 1 mole of that substance.
In other words, it tells you the number of grams per mole of a compound.
The units for molar mass are, therefore, grams/mole.
An atomic mass is unit less and defined as precisely 1/12 the mass of an atom of carbon-12 not in motion.
Difference between exact mass and molecular weight
Exact Mass is what is theoretically defined by Einsteinu2019s E=Mc^2 or what is practically evaluated by Isaac Newtonu2019s F/A.
(E-energy, M-mass, c-speed of light, F-force, A-acceleration),Molecular weight is composed by agreed mass of Avogadro amount of Atoms.
,Agreed mass of an Atom is calculated by summation of the known masses of subatomic particles.
But in this exercise, weight of the Vacuum Plasma entrapped in the Atomic Bubble is not counted.
Also the weight of the Skin Membrane of the Vacuum Bubble is not counted.
,Difference is so negligibly small and no need to be corrected but better to be comprehended.