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- What is the half-life for the first-order decay of phosphorus-32? (P1532S1632+e) The rate constant for the decay is 4.85102 day-1.Fluorine-18 is a radioactive isotope that decays by positron emission to form oxygen-18 with a half-life of 109.7 min. (A positron is a particle with the mass of an electron and a single unit of positive charge; the equation is F918O188+e+10 Physicians use 18F to study the brain by injecting a quantity of ?uoro-substituted glucose into the blood of a patient. The glucose accumulates in the regions where the brain is active and needs nourishment. (a) What is the rate constant for [lie decomposition of ?uorine-18? (b) If a sample of glucose containing radioactive fluorine-18 is injected into the blood, what percent of the radioactivity will remain after 5.59 h? (c) How long does it take for 99.99% of the 18F to decay?Which of the following reactions occur spontaneously as written, with the production of a measurable electric current? a I2+NaBrBr2+2NaI b Li+NaClLiCl+Na c Li++Na+NaLi d Ag+LiAg+Li+ e 2Li++F22LiF
- Suppose K = 4.5 103 at a certain temperature for the reaction PCl5(g)PCl3(g)+Cl2(g) If it is found that the concentration of PCl5 is twice the concentration of PCl3, what must be the concentration of Cl2 under these conditions?A suggested mechanism for the gas phase decomposition of nitrous oxide is: step 1: NgÐ — Nz + 0 N₂O + O N₂ + O2 step 2: (a) Identify the molecularity of each step in the mechanism. step 1 8 step 2 (b) Write the equation for the net reaction. Use the smallest integer coefficients possible. If a box is not needed, leave it blank. 8 (c) Identify any intemediates and/or catalysts in this mechanism. Catalyst: Enter formula. If none, leave box blank: Intermediate: Enter formula. If none, leave box blank: The following mechanism has been proposed for the gas phase reaction of nitrogen monoxide with bromine. step 1: NO + Br₂ → NOBr₂ NOBr₂ + NO 2 NOBr step 2: (a) Identify the molecularity of each step in the mechanism. step 1 step 2 (b) Write the equation for the net reaction. Use the smallest integer coefficients possible. If a box is not needed, leave it blank. (c) Identify any intermediates and/or catalysts in this mechanism. Catalyst: Enter formula. If none, leave box blank: Intermediate:…As2. The reaction p+188O→189F+n requires an input of energy equal to 2.438 MeV . What is the mass of 188F?
- Suppose that sodium pentobarbitol is used to anesthetize a dog. The dog is anesthetized when its bloodstream contains at least 45 milligrams (mg) of sodium pentobarbitol per kilogram of the dog's body weight. Suppose also that sodium pentobarbitol is eliminated exponentially from the dog's bloodstream, with a half-life of 5 h. What single dose should be administered in order to anesthetize a 50-kg dog for 1 h?Polonium-209, an α� emitter, has a half-life of 102 years.How many α� particles are emitted in 2.0 ss from a 1.8 ngng sample of 209Po209Po?If a patient is administered 60 ng of technetium−99m, how much will remain 1 d later, assuming that no technetium has been eliminated by any other process? The half-life of technetium−99m is 6 hours.
- 238 CHAPTER 8 4. Consider the dissolution reaction of potassium bromide (KBr, M = 119,01 g/mol) represented by the chemical equation below: KBr(s) → K*(aq) + Br (aq) Thermodynamic data for solid and aqueous KBr are shown in the table below: AH formation (kJ/mol) Substance KBr(s) -393.8 K*(ag) -252.4 Br (aq) -121.6 (a) Calculate the enthalpy of dissolution for KBr(s) from the data. The lattice enthalpy of an ionic solid is the enthalpy of the reaction that forms the gas-phase ions from the solid, as represented in the chemical equation below. KBr(s) K*(g) + Br(g) AH° lattice = +691 kJ/mol. (b) Calculate the enthalpy of the hydration reaction for KBr represented below: K*(g) + Br (g) →K*(aq)+ Br (aq) ΔΗ. hydration = ? (c) Identify the bonds broken in the lattice reaction and the bonds formed in the hydration reaction an give the relative values of these interactions based on the data for KBr.(#27) Reaction rates and decay. Tungsten undergoes first order decay to yield its isotope, with all reaction components in gaseous form. The initial concentration is 1.00 M and the rate constant at 45 degrees Celcius is 6.94 x 10 6/minute. (27a) What is the final concentration of the reactant remaining after 120 days? Type-in your answer inblank#1. The unit is Molarity but enter only the value of your answer in normal numerals (without symbols of unit and no digit or space fillers) with four significant figures. (276) Calculate the percentage amount of the original reactant that has decomposed from the above decay. Type-in your answer in Blank #2. The unit is % but enter only the value of your answer in normal numerals (without symbols of unit) with four significant figures.6c8: In addition to solving the problem please give brief explanation for concepts and solution if able.