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A scientist has 59g of Polonium-103. How much will be left after 12 yers, if Polonium-103 has a half life of 3 years.
Two peaks on chromatogram have k1= 3.1 and k2= 4.9. column efficiency is 2000 theoretical plates. Void volume is 1mL. Calculate the resolution between these compounds.
the following changes in a DNA molecule may have no effect on the protein for which the DNA codes
write a balance chemical equation for the combustion of 1 mol glycerin, and calculate delta H for this reaction at 298K if burning 1.24g of glycerin has a delta E of -54.6 kj
Predict if the following conditions would result in the formation of a precipitate, explain briefly: a) 0.0025 M Fe 3+ at pH 6.00
1.464 g of an unknown hydrocarbon (112.6 g/mol) burns in bomb calorimeter in excess oxygen. The heat capacity of the calorimeter,Cv, = 5.234 kJ/ºC and ?T =5.744 ºC. Find ?E for this hydrocarbon in kJ/mol.
The Ksp of calcium carbonate, CaCO3, is 3.36 × 10-9. Calculate the solubility of this compound in g/L.
If there are 0.640 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the molar concentration of the original solution? The molar mass of NaCl is 58.44 g/mol.
Plutonium-239 is a byproduct of the fission reaction used to produce energy in nuclear power reactors. It has a half-life of 24,400 years. A student determines that it will take 97,600 years for the radioactivity of a Pu-239 sample to drop to one-..
A sample of water is collected over water at a total pressure of 616.8 mmHg at 300 C. The vapor pressure of water at 300 C is 31.8 mmHg.
Find the energy of a photon of light if the wavelength of the light wave is 6.88 x 10-7 m.
Which reagent would be best for achieving an E2 elimination of 3-chloropentane? a. C2H5OH b. CH3CO2Na c. NaHCO3 d. NaI
If a bottle of nail polish remover contains 175mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788g/ML.
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