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An electron in the n=7 level of hydrogen atom relaxes to a lower energy level, emitting light of 397. What is the value of n for the level to which the electron relaxed?
an ordinary 3.0 v flashlight bulb draws roughly 0.25 a of current and converts about 1.0 of the electrical power into
a small bubble rises from the bottom of a lake where the temperature andnbsppressure are 4degc and 3.0 atm to the
The IR spectrum of HCN shows three absorption bands at 3312 cm-1, 2089cm-1, and 712 cm-1. Assuming HCN is linear, assign vibrations to the three absorption bands
what is the volume of HCl gas required to react with excess magnesium metal to produce 6.82 L of Hydrogen gas at 2.19 atm and 308 K?
A 5.00-mL sample of a sulfuric acid solution of unknown concentration is titrated with a 0.1401 M Sodium Hydroxide solution. A volume of 5.99 mL of the base was required to reach the endpoint. What is the concentration of the unknown acid solution
if a saturated solution of NH4NO3 at 70 degrees Celsius was cooled to 10 degrees Celsius, how many grams of solute will separate if the quantity of the solvent is 98 grams?
A solution is prepared by dissolving 12.9 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 15.00 mL sample of this stock solution is added to 53.00 mL of water.
In the reaction of noroborene to noroborenol, the exo, and endo forms are created. Why exactly is the exo form favored over the endo form
A star is estimated to have a mass of 1x10^36 kg. Assuming it to be a sphere of average radius 7.5x10^5 km, calculate the average density of the star in units of grams per cubic centimeter.
A solution is prepared by adding some solid CaF2 to water and allowing the solid to come to equilibrium with the solution. The equilibrium constant for the reaction below is Kc = 3.9x10-11.
Determine the mass percentage concentration of a sodium hydroxide solution produced by mixing 50.0 mL of a 25 % (density=2.45g/mL) sodium hydroxide solution with 10.0mL of H 2 O?
Uric acid dissociates as shown in the figure at the right with a pKa of 5.80, and can be treated as a simple monoprotic acid in this pH range.
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