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Problems
(1) Iodine-131 has a half-life of 8 days. If you started with a 12.0-mg sample of I-131, how much would remain after 24 days?
(2) Plutonium-239 is a byproduct of the fission reaction used to produce energy in nuclear power reactors. It has a half-life of 24,400 years. A student determines that it will take 97,600 years for the radioactivity of a Pu-239 sample to drop to one-eighth of its original level. Show calculations to support or refute her conclusion.
(3) Strontium-90 is present in the fallout produced by nuclear weapons testing in the atmosphere. Sr-90 is potentially dangerous to humans and animals because it substitutes chemically for calcium in bones and has a half-life of almost 29 years. What percent of the original amount of Sr-90 remains in a 61 year-old woman who unknowingly drank Sr-90 in contaminated milk when she was 3 years old?
Explain how many grams of copper (II) sulfate pentahydrate would use to make 400.0 mL of 0.750 M solution
Calculate the pH after the addition of 0.0048 mol of NaOH and Calculate the pH after the addition of 0.018 mol of HCl.
Propose a structure of each of the following compounds with the formula C5H9NO- an acyclic primary amide and a carbocyclic tertiary amide
A solution of ammonia and water contains 4.70×10^25 water molecules and 7.80×10^24 ammonia molecules. How many total hydrogen atoms are in this solution
Question- The cell potential of this electrochemical cell depends on the gold concentration in the cathode half-cell: Pt(s)|H2(g,1atm)|H+(aq,1.0M)||Au3+(aq,?M)|Au(s). What is the concentration of Au3+ in the solution if Ecell is 1.21V
As a technician in a large pharmaceutical research firm, you need to produce 350.mL of 1.00 M potassium phosphate buffer solution of pH = 6.87. The pKa of H2PO4- is 7.21.
What products would you expect from reaction of 1-bromopropane with the reagent NAI? I believe this is a SN2 reaction
If, in a certain experiment, over a specific time period, 0.0033 mol PH3 is consumed in a 1.5-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?
When gasoline burns, it reacts with oxygen in the air and forms hot gases consisting of carbon dioxide and water vapor. How does the potential energy of the gasoline and oxygen compare with the potential energy of the carbon dioxide and water vapo..
What is the freezing point of a solution that contains 28.3g of urea, CO(NH2)2, in 275mL water, H2O. Assume a density of water of 1.00 g/mL.
A 3.664-g sample of a monoprotic acid was dissolved in water. It took 20.27 mL of a 0.1578 M NaOH solution to neutralize the acid. Calculate the molar mass of the acid.
a block of aluminum with the volume of 96.5 g absorbs 65.3 J of heat. If the initial temperature is 31.2 degrees celcius, what is the final temperature.
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