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Calculate the wavelength in meters of light absorbed by an electron in an atom of hydrogen as it moves from n=3 to n=6.
A. 8.22*10^-7m
B. 3.28*10^-6m
C. 1.65*10^-11m
D. 1.09*10^-6m
E. 1.83*10^-7m
Calculate the pH of the 0.20 M NH3/0.24 M NH4Cl buffer. B)What is the pH of the buffer after the addition of 10.0 mL of 0.10 M HCl to 55.0 mL of the buffer?
A sample of a complex salt, with ideal composition Ni(NH3)6(NO3)2, was analyzed for nickel by dissolution in slightly acidic solution and precipitation as the dimethylglyoximate, Ni(DMG)2.
What quantity of heat is required to change 40.0 g of ice at melting point to liquid water? The heat of fusion of ice is 335 J/g. The answer should be 13400 J Please include steps in solving
the element lithium consists of two naturally occurring isotopes with relative abundances of 7.42 and 92.58. the atomic
calculate the pressure exerted in the closed end of an apparatus if the atmospheric pressure is 720.0 torr and the height of the water column is 22.3 cm.
"Soft" ionization techniques can introduce multiple charges onto a molecule to produce multiply-charged species. Show a possible spectrum for an 1800 Da peptide protonated by chemical ionizatoin with up to 4 charges. Be sure to label the axes and ..
Liquid helium at 4.2 K has a density of 0.147 g/mL. Suppose that a 1.00-L metal bottle that contains air at 98K and 2.0 atm pressure is sealed off. If we inject 60.0 mL of liquid helium and allow the entire system to warm to room temperature
If the molarity of stomach acid is 0.1 M (assumed to be HCl), how many grams of stomach acid will be "consumed" (i.e; neutralized) per gram of the antacid Ca(OH)2. Assume the denisty of stomach acid is 1.02 g/mL
A solution of a weak acid was tested with the indicators used in this experiment the colors observed were violet orange red blue and yello what is the approximate pH of the solution
How do we know if a buffer is more effective against an added acid or an added base
Select each of the reactions and observe the reactants taking part in the reactions. Suppose you are carrying out each of these reactions starting with five moles of each reactant. Observe that some reactants are in excess whereas some reactants l..
A 6.55mg/L solution of benzoic acid has an absorbance value of 0.621 at 230 nm in a 1.00cm cell. in units of M^-1*cm^-1, what is the molar absorptivity of benzoic acid at 230nm?
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