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Presume a 0.560 L sample of polluted water was analyzed for lead (II) ion, Pb2+, by adding an excess of sodium sulfate to it. The mass of lead (II) sulfate that precipitated was 229.8 mg. Explain what is the mass of lead in a liter of the water? Express the answer as mg of lead per liter of solution. (PbSO4 = 303.3 g/mol)
Assume the discharge from a waste water plant has a flow of 30MGD with a solids concentration of 5 mg/L. Determine the mass flow rate of solids discharged in unit lb/day.
Explain which atom in each of the following pairs has the greater electronegativity. Use merely a periodic table. a) O, S b) K, Ge c) Br, Te
Describe the experimental basis for believing that the nucleus occupies a very small fraction of the volume of the atom.
Geologist can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life
Homes in rural areas where natural gas service is not available often rely on propane to fuel kitchen ranges. the propane is stored as liquid and the gas to be burned is produced as the liquid evaporates.
The rate constant k for a first order reaction is 1.36 * 10 -3 s -1 at 90 degrees Celcius and the activation energy is 78.4 kJ/mol. What is the rate constant for this reaction at 50 degrees Celcius?
gas is introduced into an evacuated 3.58 L flask at 65 deg. C, what is the pressure inside the flask
The overall reaction for the corrosion of iron by oxygen is given by the following reaction. 4Fe (s) + 3O2 (g) ?? 2Fe2O3 (s) Compound ?H° (kJ/mol) S° (J/mol K) Fe (s) 0 27 O2 (g) 0 205 Fe2O3 (s) -826 90 Calculate the equilibrium constant, Keq, for..
Among the isomeric alkanes of molecular formula C5H12 give the structural Formula condensed or Bond line for the one that on chlorination yields
In a particular air mass the concentration of OH was found to be 5.4x10^6 molecules per cubic centimeter and that of carbon monoxide was 81 ppm. Calculate the rate of reaction of OH with atmospheric CO at 30° C
How many milliliters of a 0.150 M sucrose solution will be needed to perform an experiment in which 36.69 g of sucrose is needed
How many planes of symmetry does a benzene molecule possess? What chloro-substituted benzene of formula C6HnCl6-n has exactly four planes of symmetry
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