Be sure to answer all parts. Fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay. A concentration of 1 ppm of fluorine is sufficient for the purpose (1 ppm means one part per million, or 1 g of fluorine per 1 million g of water). The compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 105.0 gallons. (Sodium fluoride is 45.0 percent fluorine by mass. 1gallon =3.785 L; 1 ton = 2000 lb; 1 lb = 453.6 g; density of water = 1.0 g/mL) Enter your answer in scientific notation.

Calculate the Normality of Hcl of a solution that contains 45 g in 325 ml of water, knowing that the Molecular Mass of the Acid is 36.4 g / mol. Density is 1.19 g / ml and its purity is 27%.                 Science

OCHEMICAL REACTIONS Dilution A chemist must prepare 875. ml. of 335. M aqueous copper (11) fluoride (CuF) working solution. She'll do this by pouring out some 407. µμM aqueous copper (11) fluoride stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in ml. of the copper (11) fluoride stock solution that the chemist should pour out. Round your answer to 3 significant digits. 0 04 0/5 Y

A solution is made using 450.0 mL of isopropanol (density 0.7860 g/mL) and 137.5 mL of water (density 1.000 g/mL). What is the mass percent of the isopropanol?

A solution is made using 250.0 mL of ethanol (density 0.7892 g/mL) and 613.1 mL of water (density 1.000 g/mL). What is the mass percent of the ethanol?

A solution is made using 200.0 mL of methanol (density 0.7920 g/mL) and 1185.1 mL of water (density 1.000 g/mL). What is the mass percent of the methanol?

Blood alcohol content is a measure of alcohol in the blood as a percentage. It is calculated in grams per 100 mL of blood, so a BAC of 0.08 means your blood is 0.08% alcohol by volume. what is the total mass of alcohol (in grams) that is present for the same adult male whose total blood volume is 5.6L?

Very dilute amounts of ions and molecules are often reorted in parts per million (ppm). The units for ppm is mg solute per liter of solvent (mg/L). Given that 1.00mL of pure water weighs exactlt 1.00g, show that 1.00L of water weighs one million milligrams.

A saline solution in a gallon jug is known to be 0.4 moles per liter. Marsha takes 20 mL from the jug, and does a Chemistry lab to determine the molarity. She finds the the solution is 0.37 moles per liter. Is the number 0.4 a statistic or a parameter?

67. Pure bromobenzene, C H Br, boils at 156.0°C and has a boiling point constant of 6.26°C/m. A sample of bromo benzene is contaminated by anthracene, C4H10. The boiling point of the impure sample is 159.2°C. How pure is the sample? (Express your answer as mass percent bromobenzene.) I've spent forever trying to figure this out. For now my answer is 6.56%, but it doesn't seem right. Before, I got 97.9%. are either of those correct?