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One important daughter nucleus produced in the decay of Tellurium-132 is Iodine-132 which has a half life of 2.3 hours. What will be the count rate for a sample of Iodine-132 separated 9.3 hours after the preparation of a fresh source of Tellurium-132 whose initial activity is 6295 counts/sec?
If I add 1.65 L of water to 112 grams of sodium acetate...What is the molality of NaC2H3O2 in this solution?
In a particular photoelectron spectrum using 21.21 eV photons, electrons were ejected with kinetic energies of 11.01 eV, 8.23 eV, and 5.22 eV. Sketch the molecular orbital energy level diagram for the species, showing the ionization energies of th..
Predict whether the following will result in an increase or decrease in entropy and justify your reasoning. Desalination of water
How many grams of dry NH_4Cl need to be added to 1.60 L of a 0.700 it M solution of ammonia, NH_3, to prepare a buffer solution that has a pH of 8.62? K_b for ammonia is 1.8 * 10^{-5}.
The rate constant for the first order reaction below is K=3.3*10 -2 min -1 at 57 Kelvin. what is the half life for this reaction at 57 Kelvin
Calculate the binding energy of the 2s electron in iron and calculate the binding energy of the 2s electron in iron. Does the new energy agree better with experiment?
Calculate the pH at the equivalence point for titrating 0.170 solutions of each of the following bases with 0.170 M HBr
How many liters of CO2 are produced when 15 liters of O2 are consumed
magnesium carbonate was added to 25cm cubed of 2.0 moldm cubed of nitric acid. they react in the following reaction
Should you install a solar water heater? The average home has a 200 liter hot-water tank, which is effectively drained and replenished three times per day.
Consider the following reaction: 2A + B → 3C + D If 63.0 mol A and 42.0 mol B react to form 54.0 mol C. What is the percent yield of this reaction.
determinenbsp the molarity of a solution of sodium hydroxidenbsp naoh if 27.9 ml of this solution combines exactly with
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