I think is 1 and a half km
Net ionic equation can be written from complete ionic equation by canceling the spectators ion from complete ionic equation.
For example:
Balanced Chemical equation:
HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)
Ionic equation:
H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)
Net ionic equation:
H⁺(aq) + OH⁻(aq) → H₂O(l)
The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.
Spectator ions:
These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.
CuO: Copper oxide
"Copper(II) oxide or cupric oxide is the inorganic compound with the formula CuO. A black solid, it is one of the two stable oxides of copper, the other being Cu₂O or cuprous oxide. As a mineral, it is known as tenorite."
Answer: 172.2 g of 
is formed by adding sufficient silver nitrate to react with 1500.0mL of 0.400M barium chloride solution.
Explanation:
To calculate the moles, we use the equation:
According to stoichiometry:
1 mole of 
produce = 2 moles of
Thus 0.6 moles will produce =
moles of
Mass of 
Thus 172.2 g of is formed by adding sufficient silver nitrate to react with 1500.0mL of 0.400M barium chloride solution.
