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.
CuSO4 is the chemical formula of copper(II) sulfate.
NH3 is Ammonia, which is not an acid.
Ammonia is the scientific name for NH3.
The French term for 'umbrella stand' is 'un porte-parapluie' (plural: des porte-parapluies) in French.
NH3 is known as ammonia.