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Technitium-99 is ised to image internal organs in patients, and is most often used to assess heart damage.It decays by gamma emission. The rate constant, k, for Tc-99 is 0.116 h-1. (a)Show your calculations and determine the half-life of Tc-99 (in hours). (b)The delivery of a sample of Tc-99 from the reactor to the nuclear medicine lab of the hospital takes 3h. What is the minimum amount of Tc-99 that must be shipped in order for the lab to receive 10.0 mg? Show you working please
A cylinder with a moveable piston contains 0.90 mol of gas and has a volume of 342 mL. What will its volume be if an additional 0.22 of gas is added to the cylinder?
Consider the titration of 50.0 mL of 0.217 M hydrazoic acid (HN3) (Ka = 2.6 x 10-5) with 0.183 M NaOH. determine the pH of the solution before any NaOH is added ?
The density of hydrogen gas in a flask is 0.147 g/L at 305 K. what is the pressure inside the flask? Calculate the density in G/L of CH4(g) at 75 Celsius and 2.1 atm (R= .08206 L*atm/mol*K).
Explain the type of nonrenewable energy resource used and their short-term and long-term effects on the environment
I need help in describing the adverse effects caused by exposure to radiation. Include some specific exposure levels associated with these significant health effects.
If a reaction mixture contains only N2O and NO2 at partial pressures of 1.0 atm each, the reaction will be spontaneous until some NO forms in the mixture.
If the heat of combustion for a specific compound is -1390.0 kJ/mol and its molar mass is 61.39 g/mol, how many grams of this compound must you burn to release 821.90 kJ of heat.
Data for the decomposition of hydrogen peroxide at some set temperature T is provided below. The rate law depends only on the concentration of H2O2
explain why nitration occurs more rapidly in a mixture of concentrated nitric and sulfuric acids than in concentrated nitric acid alone
A weak monoprotic acid is exactly neutralized by 11.17mL of a standardized 0.1455M NaOH solution. If the Ka of the acid is 0.00084, what is the pH at the half-equivalence point.
what is the appropiate mechanism for the radical polymerization of 1-butyne? show the polymerization of three units of 1-butyne.
Explain Oxidation of Elements and Their Reactions, Which element is oxidized and which element is reduced in each of the following reactions?
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