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Problem- The lowest electronic transition frequently corresponds to an electron in the highest occupied molecular orbital" or HOMO absorbing a photon and moving to the "lowest unoccupied molecular orbital", or LUMO. Using the particle in-a box model for linear conjugated "pi" systems, estimate the wavelength of light, , necessary to promote an electron from the HOMO to LUMO levels for: 1,3 butadiene and 1,3,5hexa-triene.
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The enzyme catalyzes the hydrolysis of esters such as methyl benzoate. Use the Michaelis-Menten and Lineweaver-Burke graphs to determine Km and Vmax
An unknown mass of each of the given substances 1.Sand (tf=70.4 C),2.Pyrex glass(tf=67.6 C),3.water(tf=55.9 C) ,4.ethanol (tf=45.9 C), initially at 19.0 degrees Celsius, absorbs 1930 Joules of heat. Find out the mass of each substance.
A soln was made by dissolving 5 g of sodium iodide in enough water to make 500mL of soln. What is the expected percent transmittance for this soln?
the daily output of stomach acid gastric juices is 1000ml to 1400 ml. prior to a meal stomach acid hcl typically has a
The difference between the energy of the photons and the kinetic energy of the electrons corresponds to the energy needed to remove the electrons (that is, the ionization energy). Suppose that a PES experiment is performed in which mercury vapor i..
What is the composition of the initial distillate. What is the composition of the final distillate. Explain your reasoning.
A gas occupying a volume of 695 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
The equilibrium constant willYet another reaction has an equilibrium constant at 25 . It is an exothermic reaction, giving off quite a bit of heat while the reaction proceeds. If the temperature is raised to 200 , what will happen to the equilibri..
What is the main component of the first eluting peak and what percentage of the total absorbance at 300nm is due to this component?(assuming the light path- length = 1.0 cm)
A beaker contains 21.0 g of hot water at a temperature of 88.8oC. After a while, the temperature of the water falls to 24.3oC. How much heat was lost by the water. The specific heat of water is 4.184 J g-1 oC-1.
Stoichiometry limiting reagent: find the reagent in excess. then calculate the mass or volume of the products formed.
The t1/2 of a second order reaction is 26.0 hours when the initial concentration of the reactant is 0.256M. How many minutes would it take for the concentration of the reactant to drop from 0.256M to 0.064M
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