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You are asked to rapidly assay the purity of a sample, but do not have access to instrumentation. You decide to use TLC and melting point to check its purity. With 10:1 hexane:ethyl acetate solvent, the sample gives one spot by TLC (Rf = 0.15) and has a melting point range of 115 - 125 °C.
(a) Do you think the sample is pure? Why or why not?(b) Using the tools you have at hand (a melting point apparatus and TLC setup), what other data could you collect to test your hypothesis from part a? Give two possibilities.
If the pressure increases to 800. torr, how many moles of gas were added to the container? Assume a constant-volume container.
Write out the un-ionized structure of valine & phnylalanine. Do either have enantiomers? Write the zwitterion structures of both.
To obtain the same antifreeze protection requires 76 g of propylene glycol to replace each 62 g of ethylene glycol. Calculate the mass of propylene glycol required to replace 9.00 gal of ethylene glycol.
How much heat do you need to raise the temperature of 150 g of gasoline from 30oC to 15oC?
When 6.40 g of CH3OH was mixed with 10.2 g of O2 and ignited, 7.50 g of CO2 was obtained. What was the percentage yield of CO2?
Calculate the number of mmoles of primary standard grade Na2CO3. b. How many mmoles of HCl reacted with the Na2CO3? c. Calculate the molarity of the HCl solution.
Calculate molality and mass percent of alcohol in the mixture. A solution of ethanol, C2H5OH, in water has a concentration of 1.996 mol L-1. At 20.0 ºC its density is 0.9677 g mL-1
an energy of 353 kJ/mol is required to cause a Mg atom on a metal surface to lose an electron. calculate the loses frequency of that can ionize a Mg atom.
what is the molarity of a solution that contains 36.0g of vitamin B1 hydrochloride (molar mass = 337g/mol) in 190mL of solution?
If 85.0 mg of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m. ?
What causes the colors of these complexes? How do these colors relate to the expected positions of these ligands in the spectrochemical series?
The first-order decomposition of N2O5 proceeds as follows: 2 N2O5 (g) → 4 NO2 (g) + O2
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