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Americium-241 is used in smoke detectors. It has a rate constant for radioactive decay of k =1.6x10-3yr-1. How much of a 1.00-mg sample ofAmericium-241 remains after three half-lives?
Suppose a sample containing 1.200g of Compound X is heated in 25.0 mL of heptane. What is the minimum temperature required to dissolve the sample. If the sample were then cooled to 0 degrees, what would the percent recovery of the solid that would..
Calculate DeltaG °rxn. c) In which direction is the reaction, as written, spontaneous at 25 °C and standard pressure?
Calculate the pH of each of the solutions and the change in pH to 0.01 pH units caused by adding 10.0 mL of 3.48 M HCl to 350 mL of each of the following solutions
When heat is added to a solution of CoCl2 and HCl in water, what happens on the molecular level that causes the reaction to shift. Which way will the equation shift. (Hint: think about bonds forming and breaking.)
Magnesium sulfate, MgSO4, is added to 461 mL of 0.030 M sodium hydroxide, NaOH, until a precipitate just forms. How many grams of magnesium sulfate were added?
How do you derive the work equation for a non-isothermal but reversible reaction using T= Ti - c(V-Vi) and c is a positive constant
Which of the following correctly shows intrachain hydrogen bonding (???) in an alpha-helix? A. -NH HN- B. -C=O HC- C. -C=O HN- D. -C=O O=C- E. -CH HC-
Using concentrated acetic acid and solid sodium acetate, how would you prepare 10 l of 0.1 M acetate buffer at pH 4.75? The pKa for acetic acid is 4.75. What Volume of concentrated acetic acid is needed (mL)?
Multiple choice questions in Nuclear reactions - make nuclear fission more efficient, which device is used in a nuclear reactor to slow the speed
hydrocarbon produced 24.8 g of CO2 and 8.44 g of H2O. What is the empirical formula for the hydrocarbon?
An attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of 12.4°.
if the gas was not pure butane but 10 mole percent propane and 90 mole percent butane then determine how would the mw
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