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A sample of material contains contains 20 mg of I ^131. Calculate: A) The number of I ^131 atoms initially present. B) The activity in becquerels and curies. C) The number of atoms that will remain in 40 days. D) The number of atoms that will remain in 80.207 days. E) The time it will take for the activity to reach 0.001 curies.
Determine the mole fraction of sodium chloride(NaCl) in the solution if this solution is formed by mixing 17.0 grams of sodium chloride NaCl in 85.0 grams of Water?
Calculate percent recovery of panacetin from the individual masses of its mictures, sucrose (.044g), aspirine (.093), and the unknown (.339).
Use of fossil fuels - Should we be burning the raw materials for medicine and polymers? Where will we be in 50 years on this issue?
calculate the pH of this solution after the addition of 4.46 mL of 5.9 M nitric acid. The Kb of ethylamine is 6.4x10-4 some help would be awesome
What is the order with respect to OH ^-1 for this reaction. The answer is 2 and the solution is 2^X = 4 ; X=2. Do I do this with every rate reaction problem.
The resulting equilibrium solution has a pH of 10.56. What is the Ksp of the salt at 22 °C?
A chemist dissolves 284 mg of pure potassium hydroxide in enough water to make up 140 mL of solution. Calculate the pH of the solution.
phosphorus has the molecular formula P4 and sulfur has the molecular formula S8. How many grams of phosphorus contain the same number of molecules as 6.4 g of sulfur.
what happens to recrystallization if the crystals obtained by suction filtration are not washed with fresh hot solvent
solution containing the iron(II) thiocyanate complex is 0.45, Then calculate the mile per liter concentration of the complex
Calculate the normal boiling point of a 1.7m aqueous solution of the molecular compund sucrose.
calculate the number of grams of potassium chloride kcl that will be formed by the decomposition of 6.45 grams of
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