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Suppose that an 90.0 g laboratory animal ingested 10.0 mg of a substance that contained 2.55% by mass Pu-239, an alpha emitter with a half-life of 24,110 years.
a) What is the animal's initial radiation exposure in Curies?
b) If all of the energy from the emitted alpha particles is absorbed by the animal's tissues, and if the energy of each emission is 7.77E-12 J. What is the dose in rads to the animal in the first 4.0 hours following the ingestion of the radioactive material?
c) Assuming a biological effectiveness factor of 20, what is the 4.5 hour dose in rems?
why are the rates of diffusion of carbon monoxide and nitrogen gas are virtually identical at the same temperature?
The magnesium and calcium ions present in seawater([Mg2+] = 0.059 M and [Ca2+] = 0.011 M) can be separated by selective precipitation with KOH.
Explain how to determine exclusion limit of a gel of unknown origin.
A white precipitate formed when the barium hydroxide solution was mixed with the sulphuric acid. *Mass of filter paper=0.96g *Mass of filter paper and precipitate=5.25g
Why is acceptable to use a mixture of the alpha and beta anomers of D-(+)-mannose in this reaction? (i.e. why isn't it necessary to use either a pure alpha or the pure beta anomer? 2. What is the role of ferric chloride?
what volume of 0.366M Ni(NO3)2 is required to completely react with 55.8 ml of 0.500M Na2CO3.
In order to produce 10000.0 kJ of energy, how many grams of oxygen must react?
60.0 mL portion of of 1.70 M solution is diluted to a volume of 288 mili litres. A 144-mili litres portion of that solution is diluted using 115 mLili litres of H2O. Determine the final concentration.
a solid sample containing some Fe+2 ion weighs 1.062g. It requires 24.12mL 0.01562 M KMnO4 to titrate the Fe+2 in the dissolved sample to a pink end point.
what is the enthalpy change per mole of ethanole burned. the spacefic heat capacityof H2O is 4.184J/gC
What is the pH of the solution obtained when 135 mL of 0.618 M NaOH is diluted to 16.0 L with water?
The lid is tightly sealed on a rigid flask containing 3.50 L H2 at 17 °C and 0.913 atm. If the flask is heated to 71 °C, what is the pressure in the flask?
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