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The second line of the Balmer series occurs at a wavelength of 486.13 nm. What is the energy difference between the initial and final levels of the hydrogen atom in this emission process? A. 2.44 x 10 18 J B. 4.09 x 10 -19 J C. 4.09 x 10 -22 J D. 4.09 x 10 -28 J
Citric acid is a triprotic acid with pKa1=3.15; pKa2=4.77; pKa3=5.19. Calculate the concentrations of all species in solution.
The concentration of carbonate ion (CO32-) is 1.2 x 10-7 M. The precipitation of CaCO3 is favored under conditions in the ocean. If all of the CaCO3 precipitated what would be the concentration of the excess reactant
a 0.500 l solution of 7.50 m hydrochloric acid is used to neutralize a 250.0 g sample of calcium hydroxide. calcium
The half life for the radioactive decay of C-14 is 5730 years and is independent of the initial concentration. How long does it take for 25% of the c-14 atoms in a sample of C-14 to decay?
An experiment was performed to determine the solubility and the solubility product constant of lead(II) chloride (gmm = 278.10).The equilibrium involved is
Consider the general chemical equation. 9 A + 2 B ---> 8 C + 4 D (a) How many moles of C are produced from 9 moles of A. (b) How many liters of gas D are produced from 9 liters of gas A at the same temperature and pressure
Cobalt oxide, CoO, is a largely ionic compound. What coordination number and crystal structure would you expect for this oxide
Calculate the molarity of sodium ions in a solution made by diluting 50.0 mL of 0.874 M sodium sulfide solution to a total volume of 250.0 mL
A solution of 75.0 of benzene and 75.0 of toluene has a total vapor pressure of 80.9 at 303 . Another solution of 100.0 benzene and 50.0 toluene has a total vapor pressure of 93.9 at this temperature.
a gas is confined to a cylinder under constant atmospheric pressure. when 415 j of heat is added to the gas it expands
a balloon is filled to a volume of 5.0 102 ml at a temperature of 29.0degc. the balloon is then cooled at constant
determine which of the given alcohols 2-methylhexan-3-ol 3-methylpentan-3-ol 33-dimethylpentan-2-ol
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