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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?
A certain radiation has a wavelength of 474 nm. What is the energy, in joules, of (a) one photon
what is the enthapy change needed to heat 1 kg of water at 0.4 MPa and 4°C to steam at 150°C and 0.4 MPa? b/ Does a state change from saturated vapor at 230°C to the state 100°C and 0.05 MPa represent an enthalpy increase or decrease?
A 322 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 635 mmHg. Calculate the moles of Ar present.
determining the difference between vinylic & allylic hydrogens in a Cyclohexene, how many of each, what determines it?
What is the best and easy way to determine the frequency (in hz) of the interacting photon. A photon interacts with a ground state electron in a hydrogen atom and is absorbed.
You have 170. mL chlorine trifluoride gas at 669 mmHg and 45°C. What is the mass (in g) of the sample?
At 700 K the equilibrium constant for the reaction CCl4(g) C(s) + 2 Cl2(g) is Kp = 0.76. A flask is charged with 2.00 atm CCl4, which then reaches equilibrium at 700 K.
2C2H6 + 7O2---> 4CO2 + 6H2O if the reaction produces 2.75 mol of H2O how many grams of CO2 are also produced?
How much heat (in kJ) is evolved in converting 1.00mol of steam at 130.0C to ice at -50.0C? The heat capacity of steam is 2.01 and of ice is 2.09 .
chlorobutenedioic acids dehydrochlorinate to give acetylene dicarboxylic acid. The Z reacts about 50 times faster
Compute the volume of the tank if this tank has 115 moles of neon gas and has a pressure of 57 atm at a temperature of 45 0C.
Vitamin C (L-ascorbic acid; MW = 176.0 g/mol) is a weak acid (pKa = 4.863). Suppose a 500.0 mg tablet is dissolved in water and titrated with 0.100 M NaOH. How many mL of NaOH are required to reach the equivalence point?
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