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Utilizing the Bohr model for hydrogen-like atoms prepare first-order estimates of the energies expected for the Ka, Kß, La, and Lß x-ray fluorescence transitions and the ionization energy of an electron in the K shell. Report the energies in KeV (1 J=6.242x1015 keV).
How many grams of ethylene glycol (C2H6O2) must be added to 1.15 kg of water to produce a solution that freezes at -4.82 degrees celsius
consider the following ksp values for metal sul?desmgc2o4 8.6 times 10-5coc2o4 2.7 times 10-9cuc2o4 2.9 times
A balloon filled with 39.1 mol of He gas has a volume of 875 L at 0.0 degrees Celsius and 1.00 atm. The temperature is increased to 38.0 degrees Celsius as the balloon expands to 998 L at constant pressure. Calculate delta E for the He sample. C H..
The major isotopes of tungsten are 182W (26.32%), 183W (14.31%), 184W (30.67%), and 186W (28.62%). What is the atomic weight of W?
a piece of metal of 10.0 gram is to be found in an insulated calorimeter having 250.0 grams of h2o that was at the
Hydrofluric acid in an aq solution has a molar mass of 20.01g/mol. A chemist dissovles a .2001g sample in 20.0 mL and titrates it
Na2CO3 is dissolved in approximately 25 mL of distilled water. How many grams of Na2CO3 are required to react with approximately 25 mL of 0.1 M HCl
Ammonia burns in oxygen according to: 4NH3(g) + 7O2(g) ? 4NO2(g) + 6H2O(l) ??H?_rxn^o=-1396 kJ given ?H_f^o(NH3)g = -46 kJ/mol and ?H_f^o(H2O)l = -286 kJ/mol the heat of formation of NO2(g) ?H_f^o(NO2)g (in kJ/mol) is: A) +48 B) -48 C) +34 D) -29
Pretend you run a reaction and your theoretical yield is 5.25 grams,but you only isolate 4.25 grams. What is your percent yield. use one decimal place
how many grams of KO2 are needed to produce 885.0 L of O2 at 22.0 degrees Celsius and 1.00 atm
A sample of gas is extracted from the air space above the water. Using a gas chromatograph, it is determined that the mass concentration of the chloroform in air is 89 mg/L. Determine the value of the Henry's Law constant in units of M atm.
Define mole, molar mass and Avogadro's. What is the relationship to one another. Example and include an example
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