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In the "free electron molecular orbital" (FEMO) theory, the electrons in a conjugated molecule are treated as independent particles in a box of length L. Predict the minimum excitation energy in butadiene.
The tetraene CH2=CHCH=CHCH=CHCH=CH2 can be treated as a box of length 8R, where R=140pm. Calculate the minimum excitation energy of the molecule.
This molecule has a charge of n-. By changing the overall charge, n, from 1- to 2- to 3- we get three different polyatomic ions. For each of these ions a) identify the central atom and b) determine the formal charge of the central atom, X.
the volume of NaOH needed to neutralize it and repeats the process several times to determine the concentration of the NaOH solution. She calculates the concentration and uncertainty in the concentration of the NaOH from the titration data.
have a buffer solution composed of 4.00 mol of acid and 1.75 mol of the conjugate base. If the pKa of the acid is 2.20, what is the pH of the buffer?
Suppose you have a sample of sodium weighing 11.50 g. How many atoms of sodium are present in the sample? What madd of potassium would you need to have the same number of potassium atoms as there are sodium atoms in the sample of sodium.
If the propanoate ion comes from strontium propionate, Sr(C3H5O2)2 then how many grams of strontium propanoate are needed? Assume it is completely soluble.
Fuel cells combine H2(g) and O2(g) to produce H2O(g). What is the crossover temperature for this reaction at standard state
A sample of nitrogen gas in a 4.6-L container at a temperature of 30.°C exerts a pressure of 3.9 atm. Calculate the number of moles of gas in the sample.
What is the molarity of an NaCl solution prepared by dissolving 9.3g NaCl in sufficient water to give 350mL of solution.
The size of a diamond is measured in carats. (1 carat=.200 g) The density is 3.51 g/cm3. How many carats is a diamond that measures .
For the reaction above, how much would be liberated by the combustion of 5.00g of iron metal in excess oxygen.
throat lozenges was dissolved in enough water to make 10.0 mL of solution at 25 degrees C. The osmotic pressure of the resulting solution was 4.95 atm. Calculate the molar mass of the compound. Answer in g/mol.
How many g of NaCl are required to prepare 250.0 mL of a 0.3440 M solution of NaCl in water?
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