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The fluoridation of city water supplies has been practiced in the US for several decades. It is done by continuously adding sodium fluoride to water as it comes from a reservoir. Assume you live in a medium-sized city of 150,000 people and that 660 L (170 gal) of water is consumed per person per day. What mass of sodium fluoride (in kg) must be added to the water supply each year (365 days) to have the required fluoride concentration of 1 ppm (part per million), that is, 1 kg of fluroide per 1 million kilograms of water? (Sodium fluroide is 45.0% fluoride, and water has a density of 1.00 g/cm^3).
What is the theoretical yeild of sodium carbonate for the equation: 2NaHCO3(s)--> Na2CO3(aq) + H2O(g) + CO2(g)
2NO2(g)has come to equilibrium, the concentration of NO2 is 2.2 x 10-3 mol/L. Calculate the molar concentration of O2 at equilibrium.
The temperature of a 12.58 g sample of calcium carbonate increases from 23.6 c to 38.2 C. if the specific heat of calcuim carbonate is 0.82 J/g-K, how many joules of heat are absorb
A solution of phosphoric acid was made by dissolving 10 g of H3PO4 in 100 ml of water. The resulting volume was 104 mL. Calculate the density, mole fraction, molarity, and molality of the solution. Assume water has a density of 1.00 g/cm3
The Ka for a weak acid, HA is 1.6 x 10^6. What are the pH and degree of ionization of the acid in a 10^-3 M solution. Calculate the pKa and pKb.
Identifying Food Groups and Calculating Calories, Question: If one slice of chocolate cake contains 35g of carbohydrate, 15g of fat and 5g of protein
Calculate the Ph after the following volumes of titrant have been added (a)0ml (b)20ml (c)59ml (d)60ml (e)61ml (f)65ml. will give all the points with some bonus points for showing all the steps
Mass Absorbance Recrystallized sample .3040 g .070 concentration of salicyclic acid in the recrystallized aspirin sample solution =.000044 M
Assuming the diver took a deep breath (6.0L in her lungs)at 1.0 atm just before entering the water, what will be the volume of air in her lungs when she gets to 10 feet of depth? She does not exhale while descending.
Which of the following pure liquids is the best solvent for carbon disulfide? HBr(l) CH3OH(l) C6H6(l) H2O(l) NH3(l)
How many kilojoules of heat are absorbed when 40.6 of mgo is decomposed into mg and O2 at constant pressure
What mass of carbon dioxide is produced from the complete combustion of 4.30×10?3 of methane
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