To help prevent tooth decay, many communities treat their water supply with a fluoride compound such as CaF(2)

How many kilograms of CaF(2) would be necessary to treat 287 kL of water to a concntration of 1.00 mg/L of CaF(2)?

To help prevent tooth decay, many communities treat their water supply with a fluoride compound such as CaF(2)
if it's 1 mg per L then you need 287,000 mg fo 287 kL (287,000L), which is 0.287 kg