IUPAC names:
SF6: Sulfur hexafluoride
Hg2Cl2: Mercurous chloride
KHCO3:potassium hydrogen carbonate
HCl(g): Hydrogen chloride
C2O3: Oxalic anhydride
Cu(NO3)2: Copper(II) nitrate
Anhydrides are compounds consisting of a non-metallic element plus oxygen. The formula for anhydrides is of the type X2On (where X is a non-metallic element and O is oxygen). In these compounds, the oxygen also has an oxidation state of -2.
Oxalic anhydride or ethanedioic anhydride, also called oxiranedione, is a hypothetical organic compound