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An electron in the n = 7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 93.1 nm. What is the value of n for the level to which the electron relaxed?
First order decomposition in which the rate constant is 0.00830 sec-1, how long will it take (in minutes) until 0.309 mol/L of the compound is left, if there was 0.517 mol/L at the start
How many grams of sodium benzoate should be added to prepare the buffer? Neglect the small volume change that occurs when the sodium benzoate is added
A graduated cylinder contains 110. mL of water. A 10.0 g piece of iron (density = 7.86 g/cm3) and a 18.9 g piece of lead (density = 11.3 g/cm3) are added. What is the new water level in the cylinder?
the heat of vaporization of benzene, C6H6, is 30.8kJ/mol at its boiling point of 80.1C. How much heat is required to vaporize 102g benzene at its boiling point?
Explain in general terms what a reference sample is and what its purpose is in spectrophotometry.
What conceptual error did he make? Determine the correct empirical formula for this compound.
How many grams of NaCl are needed to prepare 250 mL of an isotonic saline solution with a concentration of .90% , assuming a solution density of 1.0g/mL
Determine How much heat energy, is needed to convert 64.0 grams of ice at -18.0 degrees Celsius to H 2 O at 25.0 Normal Temperature ? express your answer in kilojoules
For phenylanaline can be modeled as particle on a ring. Calculate the wavelength of the transition from ground state to the first excited state.
The energy content of 1-liter of whole milk is 680 Cal. Using that data, determine how high can you climb (in meters) on a liter of whole milk.
3.5 g of a hydrocarbon fuel is burned in a vessel that contains 250. grams of water initially at 25.00 C. After the combustion, the temperature of the water is 26.55 C.
how does the first ionizaiton energy of the alkali metal in a given period compare with the first ionization energy of the halogen in the same period. what is the result in terms of how these elements tend to react with each other
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