Question

what is the systematic name of Ba(NO3)2, Fe(SO4)3

Answer 1

NOTE that in IUPAC systematic naming

we start with the CATION (the left side of the equation) and then we continue with the ANION (the right side)

we avoid numbers, only when the metal needs an specification in its charge (i.e. Fe, Ni, etc..)

for

Ba(NO3)2

NO3 is called a "nitrate" group or ion, it has a -1 charge

Ba is barium, has a +2 charge therefore

Barium Nitrate; no need to state II in oxidatio nnumber since barium is only charged with +2

NOTE:

Fe(SO4)3 DOES NOT exist, SO4 ion is charged with -2; therefore expect 2 iron atoms in molecule

for Fe2(SO4)3

in this case, we need to state the Fe+2 or Fe+3 nature ofre Iron so

SO4 (sulfate) no need to state its oxidation number since it is always -2

Iron (III) sulfate