Calculate the number of kilograms of sodium fluoride needed per year for a city of 100,000 people if the daily consumption of water per person is 150.0 gallons.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).