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The fluoridation of city water supplies has been practiced in the United States for several decades. It is done by continuously adding sodium fluoride to water as it comes from reservoir. Assume you live in a medium sized city of 150,000 people and that 660L of water is consumed per person per day. What mass of sodium fluoride, NaF, in kg must be added to the water supply each year (365days) to have the required fluoride concentration of 1ppm (part per million) that is, 1 kg of fluoride per 1 million kg of water? Sodium fluoride is 45% fluoride by mass (45kg F/100 kg NaF), and water has a density of 1.00g/cm3. The answer is supposedly 80,300 kg please show me how they got this?
Calculate deltaS(Jmol^-1K^-1) for oxalic acid and delta S (Jmol^-1K^-1) for the combustion of one mole of oxalic acid.
The infrared spectrum of the xanthene reduction product contains evidence that demonstrates that conjugation of the rings is still
How many moles of carbon, hydrogen, & oxygen are present in a 100g sample of ascorbic acid? Ascorbic acid (vitamin C) contains 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen by mass. Assume a 100 g sample of ascorbic acid.
Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the reaction:
how many grams of sugar are in 15.0% concentrated solution with a total mass 125 g?
How much heat is required to raise the temperature of 73.5 of water from its melting point to its boiling point?
A hypothetical metal has a face-centered cubic unit cell and a density of 6.12 g/cm3. The molar mass of the metal is 143.2 g/mol. What is the atomic radius of this metal?
Identify the two important classes of catalysts. Analyze the chemical reactions that take place when a biological catalyst combines
Write a balanced equation for the reaction that occurs in each of the following cases: (a) Cesium is added to water. (b) Strontium is added to water.
Calculate molarity of a KCl solution prepared by dissolving 0.525 moles of Kcl in 250. mL of water.
What is the equilibrium concentration of Cl at 1000 ? What is the equilibrium concentration of COCl2 at 1000 ?
A mixture of CO, CO2 and O2 is contained within a 275 mL ?ask at 0 ? C. If the total pressure is 780 torr, the CO has a partial pressure of 330 torr and the CO2 has a partial pressure of 330 torr, what is the partial pressure of O2
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