Question

Give the formulas for the following

Lithium oxide
Iron(III) nitrate
Aluminum oxide
Copper (II) chloride
Zinc (II) sulfate

Answer 1

Li2O

Fe(NO3)3

Al2O3

CuCl2

ZnSO4

All you have to do here is make sure your charges are balanced when you write the compound. For example, Iron (III) has a +3 charge, and nitrate has a -1 charge. You need 3 nitrates to match that charge, hence Fe(NO3)3.