Phase is not determined by the number of molecules, as a substance with any number of molecules can be either solid, liquid, or gas.
Arrangement of molecules and molecular structure matter, since solids are closely packed together, gases are not, and liquids are in between. Intermolecular forces are also stronger for solids and liquids than they are for gases.
Answer:
1 mole of NH3 has 6.023×10^23 molecules.
Hmm, I am not quite sure but if I am probably your best bet so I'd go with, either B or D.
