NH3 stands for Ammonia.It is a basic gas.
NH3 is the chemical formula of the compound ammonia. The periodic table lists elements and not compounds.
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'Des tennis' are most probably 'des (chaussures de) tennis' which are tennis shoes in English. That could also stand for 'des (terrains de) tennis', which are tennis courts.
NH3 is NOT an acid. NH3 is Ammonia. In solution it acts as a weak base.
CuSO4 is the chemical formula of copper(II) sulfate.
The French term for 'umbrella stand' is 'un porte-parapluie' (plural: des porte-parapluies) in French.
Atomic mass of NH3 is 17.So there are 1.353mol.
NH3-Ammonia