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Positronium consists of an electron and a positron (same mass, opposite charge) orbiting round their common centre of mass. The broad feature of the spectrum are therefore expected to be hydrogen-like, the differences arising largely from the mass differences. Predict the wavenumbers of the first three lines of the Blamer series of positronium. What is the binding energy of the ground state of positronium?
What is the volume in mL of 0.845 M NaOH(aq) needed to reach the equivalence (stoichiometric) point in the titration
The change cannot be determined without more specific information. It will remain constant. It will decrease by a factor of 2. It will decrease by a factor of 4.
Assume a wind turbine with a hub 50 meters above the ground, a rotor diameter of 60 meters and a wind-conversion efficiency of 25 percent. The turbine operates in an area with an average wind-power density of 700 watts/sq meter at 50 meters altitude.
Draw complete Lewis structure for following condensed structural formula. (CH3CH2)CO
If 4.5 of ammonium chloride were dissolved in 200 L of water what would be the ammonium chloride concentration in mg/L
The solubility of N2 in blood can be a serious problem (the "bends") for divers breathing compressed air (78% N2 by volume) at depths greater than 50 ft. Find the volume (in mL) of N2, measured at 25degrees celsius and 1.00 atm, released per liter..
A second 20ml aliquot was mixed with 10ml of 50ppm quinine solution before dilution to 100ml. The flourescence intensity of this solution was 600. Calculate the concentration in ppm in the tablet.
what is the partial pressure of each gas if the total pressure of each gas if the total pressure is 735 mm Hg
Cryolite, Na3AlF6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Balance the equation.
Consider a solution formed by mixing 48.0 mL of 0.100 M H2SO4, 36.0 mL of 0.100 M HOCl, 25.0 mL of 0.200 M NaOH, 2 mL of 0.100 M Ca(OH)2, and 10.0 mL of 0.150 M KOH. Calculate the pH of this solution.
A pair of theoretical enantiomers is named below. For each stereoisomer, draw the structure. Be sure to specify the stereochemistry via wedge-and-dash bonds.
what is the molecular formula of the compounds created by fecl3
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