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A radioisotope of iodine 131I is utilized to study thyroid function. A patient is given a sample that is 1.7 * 10-4 M 131I. If the half life is 8.04 days define what fraction of the radioactivity remains after 32.0 days. Radioactive decay is a first order process.
A 3.46 g sample of zinc heated to 95.4 C was dropped into 50 g of water at 20.7 C in a calorimeter. The temperature rose to 21.2 C. What is the specific heat of zinc?
Consider the steel tank whose volume is 42.0 L and which contains oxygen gas at a pressure of 18,000 kPa at 23° C. What mass of oxygen does the tank contain?
question a sample of n2g was collected over water at 25 degrees celcius and 730 torr in a container with a volume of
Draw structural formulas and complete. Write the names under the products and indicate the major one. Show the reaction mechanism for the reaction in 3b. Use Lewis structures and curved arrow notation.
Why does the color of a precipitate change from the color of the original solution. For example, if copper sulfate is blue, why is it's precipitate white
a.) Available Electrons (AE) b.) Needed Electrons (NE) c.) Geometry Description d.) Number of sigma bonds e.) bonding description f.) lewis dot structure
Calculate the pH of a solution prepared by dissolving 0.75 mol of NH3 and .025 mol of NH4Cl in water sufficient to yield 1.00 L of solution. The kb of ammonia is 1.8 x 10-5.
How many total moles of oxygen gas can be generated through this decomposition? B. If this oxygen is formed within the bottle described in question 1, what change in pressure would be predicted?
Suppose that this individual now decides to give one-eighth of a percent (0.125 ) of her new net worth to charity. How many dollars are given to charity? The answer is not 10.0025 or 12.5. I have been working at this problem and just need to figur..
a sample weighing 25g starts at 99 degrees celsius. it is put in a calorimeter containing 100g water. the water
A proton in a magnetic field has two spin states, one aligned with the field B and the other anti aligned. the energies of these spin states are E down=hyB/2 and E up =-hyB/2, where y=26.8*10^7 (Tesla)^-1.
A buffer solution contains 0.386 M NH4Cl and 0.316 M NH3 (ammonia). Determine the pH change when 0.064 mol HBr is added to 1.00 L of the buffer
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