Question: how many oxygen atoms are in one formula unit of cupric nitrate?
Answer: Example: The number of atoms in four formula units of copper (II) nitrate is 4Cu(NO3)2. (4)(1) = 4 atoms of copper (4)(1)(2) = 8 atoms of nitrogen (4)(3)(2) = 24 atoms of oxygen Total number of atoms: 4 + 8 + 24 = 36 atoms.