Question

How many atoms of oxygen are in one formula unit of Al2(SO4)3? 4 6 7 12

What is the name of the compound Cr2(CO3)3?

Which of the following contains both ionic and covalent bonding?

NaClO
NO2
FeBr3
HI

Answer 1

1) aluminium sulfate has 12 atoms of oxygen (4 · 3 = 12).
2) name of the compound is chromium(III) carbonate. Chromium has oxidation number +3 and carbonate has -2.
3) NaClO contains both ionic and covalent bonding, ionic bond is between sodium and chlorine and covalent bond is between chlorine and oxygen.