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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?
Calculate the molarity of a solution made by dissolving 0.0715 mol Na2SO4 in enough water to form exactly 550. mL of solution
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What must be the atomic mass of the metal M If A sample of the compound MSO 4 weighing 0.1131 g reacts with barium chloride and yields 0.2193 g BaSO4.?
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A mixture of 70 mole% butane and 30 mole % hyrdrogen is burned with excess air. Fractional conversion of 85% of the butane and 90% of the hydrogen are achieved
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A 25.0g sample of nitrogen (N2) has a volume of 50.0L and a pressure of 630.0 mmHg. What is the temperature of the gas.
Determine what type of bond is expected for a compound formed between Magnesium and Oxygen Based on these values,?
In a particular experiment, 2.25 g of NH3 and 3.75 g of O2 are placed in a container and allowed to react. How many grams of NO will have been formed when all of the limiting reactant has been consumed.
An electron traveling at the velocity of 3.7 105 m/sec has an uncertainty in its velocity of 2.34 105 m/s. determine the uncertainty in its position?
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