What is the mass of 3.01 x10^23 molecules of ammonia?

Of Molecules = Mass/Molar Mass × Avogadro's Number.
Mass = 8.5 g. Hence, the Mass of the Ammonia is 8.5 g.

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.