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The amount (N = grams) of radioactive material present in a sample as a function of time is given by the following equation, where No is the amount present at t = 0. : N (t) = No e^-kt At Great Basin College, we have a specimen of a highly radioactive material called Polonium Sulfate. It is very radioactive. On March 1st we had 100 grams. On March 1st the next year we had 46.97 grams left. What is the "k" factor for this material in the units of "per second"
a. 5.7 x 10^-7 sec^-1
b. 8.8 x 10^-6 sec^-1
c. 9.2 x 10^-3 sec^-1
d. 7.4 x 10^-5 sec^-1
e. 2.4 x 10^-8 sec^-1
f. 5.5 x 10^-8 sec^-1
An antacid tablet containing calcium carbonate as an active ingredient required 26.8mL of .112 M HCL for complete neutralization. What mass of CaCO3 did the tablet contain?
At 8:00 a.m., a patient receives a 58-mg dose of I -131 to obtain an image of her thyroid. If the nuclide has a half-life of 8 days, what mass of the nuclide remains in the patient at 5:00 p.m.
1-phenyl-3-p-hydroxyphenyl-2-propen-1-one has a lower pKa value than does phenol. Account for this and the color of the phenoxide in terms of resonance structures for the anion.
How many grams of water at 0oC could be frozen to ice at 0oC by the evaporation of 493 grams of isopropyl alcohol?
Complete and Balance the following redox equation. MnO4 + H +Br-->Mn2 +Br2 +H2O (acidic Solution). The sum of the smallest whole number coefficients is
What products would you expect to obtain in the reaction of acetaldehyde with KOH? why are the products different than those obtained from the Cannizzaro reaction?
How many milliliters of 0.0759 M NaOH are required to titrate 25.0 mL of 0.0896 M HBr to the equivalence point?
How many grams of potassium chlorate decompose to form potassium chloride and 450. mL O2 at 128°C and 750. torr?
Calculate the entropy change. What would be the value of S if the heating were carried out irreversibly?
Suppose the pH of the water is 4.59 and that the concentration of iron(II) in the water is 7.99x 10-5 M, what is the potential of the corrosion reaction under the above conditions at 298 K?
Covert the EU Nitrate standard of 50ppm to its nitrogen content alone. Is the EU standard more or less stringent than the United States regulatory limit
Write the overall equation for the reaction. B) Do you expect this reaction to go by an E1 or an E2 mechanism?
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