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By using photons of specific wavelengths, chemists can dissociate gaseous H-I to produce H atoms with accurately known speeds. When H-I dissociates, the H atoms move away rapidly, whereas the relatively heavy I atoms move little. Average Bond Energies
(a) What is the longest wavelength (in nm) that can dissociate a molecule of H-I?
(b) If a photon of 253 nm is used, what is the excess energy (in J) over that needed for the dissociation?
(c) If all of this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)?
Which of the following correctly describes the equalibrium constant for the gas phase reaction between H2 and O2 to form gaseous H2O? a.) Kc = [H2O]/[H2][O2] b.)Kc = [H2O]^2/[H2][O2] c.) Kc = [H2O]^2/[H2]^2[O2] d.) Kc = [H2][O2]/[H2O] e.) Kc = [H2..
What pressure is needed to confine an ideal gas to 102.0 L after it has expanded from 8.0 L and 1.0 atm at constant temperature
What is the cellular free energy change for the phosphofructokinase reaction at 37°C? c) What is the equilibrium constant for the phosphofructokinase reaction
15 g of steam at 373 K is added to 250g of H2O (l) at 298 K at constant pressure of 1 bar. Is the final state of the system steam or liquid water? Calculate ?S for the process.
A certain weak base has a Kb of 7.40 x 10^-7. What concentration of this base will produce a pH of 10.06
What volume of chlorine gas is produced when 0.952 mol of hydrochloric acid reacts completely according
a mass of 47.5 g of h2os at 273 k is dropped into 225 g of h2ol at 298 k in an insulated container at1 bar of pressure.
The electric field at the surface of a charged, solid, copper sphere with radius 0.160m is 3400N/c , directed toward the center of the sphere.
Calculate the mass of silver chloride required to plate 245 mg of pure silver. Silver chloride, often used in silver plating, contains 75.27% Ag
Predict the wavelength (in nm) of the lowest-energy electronic transition in the following polymethine ion:((CH_{3})_{2}N^{+}=CH-CH=CH-CH=CH-N(CH_{3})_2) Assme that all the C-C and C-N bond lengths equal
Show the calculation for the moles of benzaldehyde, the moles of acetone, the theoretical yield of dibenzalacetone in grams, and the calculation for the % yield of the product (dibenzalacetone). Also indicate which reagent is the limiting reagent.
What strongest lines of the He+ spectrum occur at the following wavelengths:1) 127.57 nm 2) 164.12nm 3)25.64 nm. Calculate the transitions associated with these lines.
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