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If a helium atom absorbs a photon with a wavelength of 58.44 nm, one electron will be promoted from the 1s orbital to a 2p orbital. Find the energy, in J, gained by a helium atom undergoing this transition.
The ionization energy of helium is 2372 kJ/mol. Suppose that a helium atom has already undergone the transition above, so that it has one electron in a 2p level. What is the longest wavelength of light that would be capable of supplying enough energy to eject an electron from this excited helium atom, producing a He+ ion?
Why is Pyrex glass wool, rather than typical filter paper, used for the filtration of the hot solution of K+, [Al(H2O)2(OH)4]- , excess OH-?
The percent ionization of octylamine in a .10 M aqueous solution is 6.7%. What is the pH of the solution and the Kb of octylamine?
Metabolic regulation is achieved via regulating enzyme activity in 3 ways: allosteric regulation, covalent modification, and enzyme synthesis/degradation.
Draw the product that is formed when the compound shown below is treated with an excess of hydrogen gas and a platinum catalyst.
By what factor (how many times) will the rate constant increase when the temperature is raised from 10°C to 28°C?
A solution of acid was found to have a hydrogen ion concentration of 0.03 mol dm-3 what is the pH of the solution?
A 20.0-mL sample of 0.200 M HBr solution is titrated with 0.200 M NaOH solution. Calculate the pH of the solution after the following volumes of base have been added.
consider the reaction of 5.0g of propane with 10.0ml ofmolecular bromine to form 2,2 dibromopropane and hydrogenbromide. a. look up the molecular weight of propane (44.1) and calculate the moles of propane present before the reaction
A certain protein was found to contain 0.412% manganese by mass. Determine the minimum molecular mass of the protein.
Compute the % sodium carbonate (MM = 105.99 g/mol) in this sample.
What volume of water vapor is created by the complete combustion of 38.7 liters of methane gas?
You need to dissolve CaCl2 in water to make a mixture that is 41.0% calcium chloride by mass. If the total mass of the mixture is 363.9g what masses of CaCl2 and water should be used
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