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Iodine-131 is a radioactive isotope. After 4.00 days, 70.8% of a sample of 131I remains. What is the half-life of 131I?
An environmental engineer analyzes a sample of air contaminated with sulfur dioxide. To a 500. mL sample of air at 700. torr and 38°C, she adds 20.00 mL of 0.01017 M aqueous iodine, which reacts as follows:
How many grams of potassium accetate must be added to 2.5 L of .250 M acetic acid
Using the ?H for the reaction of NaOH + HCl and the reaction of NaOH + NH4Cl How do you calculate an enthalpy change for reaction of HCl + NH3?
Propane reacts with excess oxygen to produce carbon dioxide gas and water. What volume of CO2,measured at 27.2 °C and 0.918 atm, is produced from the reaction of 10.1 g propane with excess oxygen.
From the following chemical reactions determine the relative Bronsted-Lowry acid strengths (strongest to weakest). HCLO4 (aq) + H2O (l) ----> H3O (aq) + ClO4- (aq)
For this system, calculate the change in entropy (ΔS), the change in internal energy (ΔU), and the change in enthalpy (ΔH) for a reversible adiabatic expansion of this gas to a final pressure of 1.10 atm. Also calculate the final temperature (T) a..
Explain in detail why these bacteria don't begin to excrete this metabolite before using up the phenylalanine in the medium.
What volumes of the stock solution will you have to pipet into the flasks to prepare standards of 1.00, 2.00, 5.00 and 10 x 10 -3 M KMnO4 solutions?
The gas from a certain volcano had the following composition in mole percent (that is, mole fraction multiplied by 100). 56.0% CO2, 34% H2, 5.4% HCl, 2.4% HF, 2.1% SO2, and 0.1% H2S What would be the partial pressure of each of these gases if the t..
If a 0.10 M solution of an acid has a pH of 4.5, what would be the predicted pH of a 0.10 M solution of the conjugate and why
what would be the atmospheric pressure of MTBE in Pa If this sample were at equilibrium with atmospheric MTBE? KH = 1.7 M/atm.
identify organic compounds in medications. determine the structure of one active component and identify three functional groups on each molecule.
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