If a child accidentally swallowed 2 fluidounces of Feosol elixir containing 2/3 gr of ferrous sulphate per 5 mL, how many milligrams of ferrous sulphate did the child ingest?

2 oz * (29.57 ml)/(1 oz) * (2/3 g)/(5 ml) = 7.88 g = 7880 mg