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A certain molecule fluoresces at a wavelength of 400 nm with a half-life of 1.0 ns. It phosphoresces at 500 nm. If the ratio of the transition probabilities for stimulated emission for the S* --> S to the T --> S transitions is 1.0 x 10^5, what is the half-life of the phosphorescent state?
Which of the following peptides has a pI close to 5.5? Assume that the pKa value of the alpha-amino group is 9.6 and the pKa for the alpha-carboxylate group is 2.3. A. Ser-His-Arg-Asn
Find the mass of urea (CH4N2O) needed to prepare a 50.2g of a solution in water in which the mole fraction is 7.51*10^-2.
Calculate the volume of a sample of nitrogen at -74 ?C and 1.3 atm if it occupies a volume of 4.07 L at 94.6 ?C and 1080 mmHg
1.it is noted that pure ethanol ch3ch2oh has density 0.80625 gcmsup3 at 0.0deg c and density of 0.78945 gcm sup3 at
The standard free energy change associated with the dissolution of ammonium nitrate in water is -6.73 kJ/mol at 298.15 K. NH4NO3(s)->NH4NO3(aq) What is the equilibrium constant for the reaction. (R=8.314 J/K*mol)
At 105 °C, the reaction 2NO2(g) ? N2O4(g) has Kp = 0.054. What is the value of Kc at this temperature?
Carbon-14 has a half-life of 5730 years. How long will it take for a sample to decay to only 17% of its original amount
Calculate the delta h required to 1 mole of ice at -25 degrees celcius to convert steam at 125 degrees celsius
Assume a density of 1.08g/mL for the solution. A)Find molarity of solution B)Find molality of solution C)Calculate mass percent of solution
a compound containing carbon amp hydrogen atoms has a deep blue color. complete combustion of 288 mg of the compound
What minimum voltage is required to electrolyze anhydrous HF? Hint: the H-F bond is so polar that liquid HF is essentially composed of H+ and F- ions.
Assuming that the limits of the visible spectrum are approximately 380-700nm, find the angular range of the first-order and second-order visible spectrum produced by a plane grating that has 900 grooves/mm with the incident source radiation normal..
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