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The half-life for the alpha decay of 226Ra to form 222Rn is 1.60×103 y. Suppose the energy of the alpha particle is 4.50 MeV and that 1.18 g of 226Ra, freed of any other radioactive materials, were placed in a calorimeter containing 11.1 g of water, initially at 23.4°C. Calculate the temperature the water would reach after 1.11 hour. Neglect the heat capacity of the calorimeter and heat loss to the surroundings. Take the specific heat of water to be 4.184 J K-1 g-1 and the mass of a 226Ra atom to be 226.025 u. (1 eV = 1.6022 × 10-19 J)
Find the number of unpaired electrons, magnetic moment and ligand field stabilization energy (LFSE).
At 8:00 A.M., a patient receives a 56mg dose of I-131 to get an image of her thyroid. If the nuclide has a half-life of 8 days, explain what mass of the nuclide leftovers in the patient at 4:00 P.M. the next day
The precipitate of CaC2O4, weighed 1.437 grams determine the molarity of calcium chloride in the solution?
Determine the number of milliliters of standard 0.1000 M NaOH needed to make 250.0ml of NaOH solution with 0.040 M
50 ml if .15M NaNO was added to a sample containing gallium. Nitrate oxidized Ga(s) to Ga(aq). The resulting nitrous acid was titrated to the equivalence point with 27.82 mL of .1M NaOH. Determine the mass of Ga(s) in the sample
What is the pH of the buffer that results when 11 g of NaCH3CO2 is mixed with 85 mL of 1.0 M CH3CO2H and diluted with water to 1.0 L? (Ka of CH3CO2H = 1.8 ´ 10-5)
Explain what would be the concentration of HA and A-. I know I have to use the Handerson Hasselbach equation to find the ph
When the reaction 2 H2S g ~ 2H2 + S2 is carried out at 1065 degrees celcius, Kp = 0.012. Starting with pure H2S at 1065degrees, what must the initial pressure of H2S be if the equilbrated mixture at this temperature is to contain 0.250 atm of H2 (..
Discuss the importance of preclinical studies and the use of animal models in the development of medicinal products for human use
Compute the number of electrons in a flake of pure gold valued at $0.22. Assume that the price of gold is $1487.0/troy oz. (1 troy oz = 31.1 g)
What is the concentration of free [Cu2+] in an aqueous solution prepared as 0.25M in Cu2+ and 1.50M [NH3]. Cu2+(aq) + 4NH3? [Cu(NH3)4]2+ (aq) Kf = 5.0 x10^12
The hypothetical element, Bc, has three stable isotopes. The isotopic abundances and masses of the three isotopes are
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