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A 300,000-gallon tank has been storing aqueous radioactive waste since approximately 1945. The primary radioactive species in this waste is cesium, which is present as both radioactive and non-radioactive isotopes. The total cesium concentration is 0.005 g Cs/L and half of the Cs is the radioactive isotope cesium-137 (137Cs). It also is known that the specific radioactivity of 137Cs is 86.58 Ci/g, where Ci represents the unit curie, which is defined as 3.7 ? 1010 radioactive decays per s. In the radioactive decay of 137Cs, cesium is converted to barium at a rate that satisfies the expression Where N and N0 are amounts of cesium and t0.5 is the half-life of the isotope, which for 137Cs is 30.1 years. (a) What fraction of the cesium would have to be removed from the solution in order for the radioactivity to be reduced to 0.001 Ci/L? (b) What would be the total amount of Cs removed from the tank in order to reach that level of radioactivity? (c) Assuming the radioactive cesium was placed in the tank in 1945, what was the original total concentration of cesium and the corresponding radioactivity in Ci/L?
58.0 mL of a 1.30 M solution is diluted to a volume of 228 mL. A 114-mL portion of that solution is diluted using 141 mL of water.
Calculate the pH of each of the following solutions. (a) 0.115 M HONH2 (Kb = 1.1 10-8) (b) 0.115 M HONH3Cl
Compute the thermal-equilibrium values of hole and electron concentrations while Considering a homogeneous gallium arsenide semiconductor at the given temperature of T = 300 K with Nd = 1016 cm-3 and Na = 0?
A gaseous mixture of O2 and Kr has a density of 1.184 g/L at 385 torr and 300. K. What is the mole percent O2 in the mixture?
The enthalpy change for melting ice at 0C and constant atmospheric pressure is 6.01 kJ/mol. Calculate the quantity of energy required to melt a moderately large iceberg with a mass of 1.40 million metric tons.
The purity of a 0.287 -g samole of Zn(OH)2 is determined by titrating with a standard solution, requiring 37.8 mL. The HCL solution was standardized by precipitating AgCl in a 25.0-mL aliquot
Explain The Chemistry of Food Composition, find the nutritional values/info in food from USDA Nutrient Data Laboratory?
A balloon has a volume of 10,500 liters, and the temperature is 15C. If the temperature were -25C, what would the volume of the balloon be.
How much KClO3 in grams is needed to generate 7.50L of O2 at pressure of 1.00atm and temp of 298K?
A sealed-end water manometer attached to an air duct reads 1598 cm. An open-end water manometer attached to the same duct reads 556.2 cm.
Write balanced chemical equation and evaluate the molecular weight of the reactants and Calculate the molecular weights of the reactant.
A 1.17 g sample of an alkane hydrocarbon gas occupies a volume of 674 mL at 28°C and 741 mmHg. Alkanes are known to have the general formula CnH2n+2.
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