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Calculate the potential energy of interaction between the two electrons in the helium atom when they are separated by a distance of 1 Å. Similarly, what would be the potential energy of one of these electrons if it were alone in the presence of the He nucleus at a distance 1 Å? How would you combine these two results to obtain an estimate of the first ionization energy of He? Estimate the 2nd ionization energy of He by considering the distance of its electrons from the nucleus to be 1 Å.
Calculate the change in entropy when 54 ml of hot (95 C) water is added to 90 ml of cold (5 C) water is a closed cup, given that Cp (H2O, l) = 75.5 J/molK
What is the minimum mass of oxygen, in grams, needed to burn 39.7 g C6H6O? Give your answer to three significant figures
Caffeine is a stimulant found in coffee and tea . A solution of caffeine in chloroform as a solvent has a concentration of 7.9 x 10^-2m. What's the percent of caffeine by mass? Calculate the mole fraction of caffeine.
The overall equilibrium involves Ksp, Ka3 of phosphoric acid and Kw. Construct the constant and show the three equations that apply.
Draw the final step of the mechanism and predict the major product obtained in the dehydration of 2
What is the wavenumber in cm-1 for the HOMO to LUMO transition predicted by PM3, What value of ? can you infer, that would bring the HMO method into agreement with the more advanced Extended Huckel method?
For many reactions near room temperature, the rate and the rate constant approximately double for a 10 °C rise in temperature. What is the value of activation energy in kJ/mol for such a reaction?
In a typical mass spectrum, a smaller signal is observed at a mass 1 amu higher than the molecular ion peak. Why? A) Due to small impurities in the sample
began with 81.0 mmol of isopentyl alcohol, how many grams of isopentyl acetate could you theoretically produced assuming only 65.0% attainable yield?
How much 10.0 M HNO3 must be added to 1.00L of a buffer that is 0.001 M acetic acid and 0.1 M sodium acetate to reduce the pH 5.45?
Choose the answer which lists ionic compounds NaCl, MgS, KCl, and K2S in order of increasing lattice energy (smallest lattice energy listed first).
acids how many have (i) more than one chiral center, (ii) an acidic side-chain, (iii) a sulfur atom in the side-chain?
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