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what are the electronic configurations of Pb and Pb2+, also Mo and Mo2+. please explain what are their valence electrons.
The energy of a vibrating molecule is quantized much like the energy of an electron in the hydrogen atom. The energy levels of a vibrating molecule are given by the equation
If the entropy of a collection of molecules in 50,000 boxes is 3.73E-20 J/K, how many molecules are there
Calculate the [H3O+] and the pH for a buffer that consists of 0.13 M HF and 0.29 M KF. (Ka of HF = 6.8x10^-4)
A 5.00 mL sample of isopropyl alcohol has a mass of .930 g whe measured at 20 degrees celsius. What is the specific gravity of isopropyl alcohol?
The Lyman series in the hydrogen atom corresponds to transitions that originate from the n=1 level in absorption or that terminate in the n=1 level for emission. Calculate the energy, frequency, and wavelength of the least and most energetic transiti..
in order to make a solution that i s0.030 M in Cu SO4 what volume of the above solution should be diluted to 5.00 mL with water?
the pH of a saturated solution of a metal hydroxide MOH is 10.85 calculate the Ksp for the compound
an area of 1.15 m^2 and given that the acceleration due to gravity is 9.8 m/s^2, what is the mass of this column?
A sample of calcium carbonate absorbs 45.5 J of heat upon which the temperature of the sample increases from 21.1 degrees celcius to 28.5 degrees celcius.
What is the empirical formula for an prganic compound whose percentage composition is 40.0% carbon
The mass spectrum of an organic compound shows the relative abundance of M to be 34.29% and M+1 to be 8.901%. Assuming the peaks are caused by 12C and 13C isotopes, determine the number of carbon atoms in the compound. Natural abundance: 12C is 98..
Acrylonitrile, C3H3N (53.07 g/mol), is used in the synthesis of a variety of plastics. What mass of acrylonitrile can be produced from a mixtur.
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