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A diode laser emits at a wavelength of 987 nm.
(a) In what portion of the electromagnetic spectrum is this radiation found?
(b) All of its output energy is absorbed in a detector that measures a total energy of 0.52 J over a period of 32 s. How many photons per second are being emitted by the laser?
5Ca+ V2O5 ----> 5CaO + 2V In one process, 1.54 x 10^3 g of V2O5 react with 2.07 x 10^3 g Ca. Calculate the theoretical yield of V. Calculate the percent yield if 795 g V are obtained
Calculate P,V and T for initial and final states of each process and produce a plot of the two processes on a P,V diagram. Without resorting to equations, explain why the result for part (b) is greater than or less than the result for part (a).
Calculate the wavelength of the light that is absorbed for the electron's transition from n = 5 to n = 6 in Be3+ ion. (ans in nm.)
Calculate the pH at the equivalence point in a titration 45.7 mL of 0.17 M chloropropionic acid with 0.4 M KOH.
Using Acid Chlorides to Prepare Aromatic Ketones, Acid chlorides are used as electrophiles in the Friedel-Crafts reaction to prepare aromatic ketones. The reaction involves the transfer of an aromatic hydrocarbon with an acyl chloride in the prese..
compute the atomic packing factor for the diamond cubic crystal structure shown in the figure below. assume that
calculate the energy of an electron in the hydrogen atom when n=2 and when n = 6. Calculate the wavelength of the radiation released when an electron moves from n=6 to n=2. Is this line in the visible region of the electromagnetic spectrum
Explain what is the height of a column of liquid in a barometer if the density of the liquid is 0.929 g/mL and the local atmospheric pressure is 0.72bar
In Europe, gasoline efficiency is measured in km/l . If your car's gas mileage is 40.0 mi/gal, how many liters of gasoline would you need to buy to complete a 142 km trip in Europe
calculate the end point ph when 25 ml of 0.01 moll hcl solution reacts exactly with 25 ml of 0.1 moll nh4oh
Calculate the heat of solution, DeltaH_soln, of KCl. Assume that the specific heat of the solution is identical to that of water, 4.18 J/(g/C).kj/mol
Determine the exact formula of the compound. When 9.64x10-4 moles of this complex is dissolved into 425.0 mL of the water, you find that 19.22 mL of 0.1000 M HCl is needed to reach a titration endpoint
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