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Calculate the frequency (in Hz) of light necessary to move an electron in a He+ ion from the n =2 to n =4 energy level. The Rydberg constant for a helium ion is R = 4.390 x 107 m-1
What is the pH of pure water in equilibrium with 1 atmosphere of carbon dioxide at 25?C?
the water solubility of L-alanine is 127g/L at 25 degrees celsius, what is the water solubility of D-alanine at 25 degrees celsius?
Estimate the vapor pressure at temperatures of 273, 298, 363, 383, and 423 K respectively
A camera falls from a blimp that is 485 m above the ground and rising at a speed of 16.8 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s2
approximately what percentage of the acetic acid molecules are protonated and neutral in charge at pH 5.7?
What mass of carbon dioxide is produced from the complete combustion of 7.50×10^-3g of methane?
Blending of two wines with different concentrations of acid, Two wines are available for blending: One tank of 1000 L has a Titratable Acidity of 9.0 g/L and another tank containing 2000 L has a Titratable Acidity of 0.6 g/L.
What is the density of a block of marble that occupies 350 cm3 and has a mass of 660 g?Answer in units of g/cm
how many moles of Ba(OH)2 are present in 165ml of 0.600M Ba(OH)2.
If 4.50 moles of ethane, C2H6 undergo combustion,according to the unbalanced equation C2H6+O2--> CO2+H2O, how many moles of oxygen are required?
Explain Why a glacial Acetic acid in a conductance set-up does forms gradually brighter lights that is dim to bright because it is frequently diluted with water?
We add excess Na2CrO4 solution to 17.0 mL of a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has been dried and weighed, the mass of Ag2CrO4 is found to be 0.310 grams.
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