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An electron in the n=7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 93.1nm. What is the value of n for the level to which the electron relaxed?
A 0.140-mole quantity of M(NO3)2 is added to a liter of 1.030 M NaCN solution. What is the concentration of M2 ions at equilibrium?
What is the mass of a glass empty beaker? What is the mass of a glass beaker with 60mL water?
Imagine you are driving at speed 60 mph through air filled with bugs at concentration 1 per cubic meter. The windshield is a flat panel of area 2 m^2 tilted so that it is at 60 degrees with the ground. How many bugs will you collect in 5 min?
if your spectrophotometer can measure absorbance up to 1.5, what is the max concentration of nadh that your can measure
Calculate the pH during the titration of 10.00 mL of 0.400 M hypochlorous acid with 0.500 M NaOH. First what is the initial pH (before any NaOH is added)?
How much energy in kilojoules is required to convert 260 mL of water at its boiling point from liquid to vapor?
Three compounds are to be separated using HPLC. Compound A and Compound B have the same polarity but are more polar that Compound C. Compound A and Compound C have the same molecular weight (5000), and Compound B has a molecular weight of 26,000.
Calculate the fraction of atoms in a sample of argon gas at 360. K that have an energy of 14.0 kJ or greater.
What is the concentration of chromium ion present in a 0.01976 M solution of potassium hydroxide in contact with a large excess
Calculate the amount of heat (in J) required to melt the sample. Use the following data: Tp = 44oC; C = 94 JoC-1 mol-1; ?Hfusion = 2.5 kJ/mol.
A mixture of NaCl and NaBr has a mass of 2.08g and is found to contain 0.78 of Na.What is the Mass of NaBr in the mixture.
Simplest and most informative way to characterize a carboxylic acid is to determine its neutralization equivalent. The number of carboxyl group in the molecule of the following compound is 1.
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