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Elemental analysis of nicotine, which is found in tobacco, shows that it consists of 74.03% C, 8.70% H, and 17.27% N by mass. Nicotine has a molar mass of 162.23 g/mol. How many carbon atoms are in the empirical and molecular formulas of nicotine?
Calculate the pH of a solution prepared by mixing 300 mL of 0.25 M sodium hydrogen ascorbate and 150 mL of 0.2 M HCl plus water to a final volume of one liter. The Ka of ascorbic acid is 5 x 10-5.
Phenolphthalein is an acid base indicator. What color does it possess in the presence of excess hydrogen (i.e., hydronium) ions?
This solution had an absorbance of 0.810 at 510 nm and 0.476 at 656 nm in a 1.00-cm cell. a) Calculate the concentration of cobalt (in ppm) in the initial solution prepared by dissolving the sample. b)Calculate the concentration of nickel (in ppm)..
arrange the following alkenes in order of increasing heat of hydrogenation (That is, heat released when the compound is hydrogenated). 1 = lowest heat,...................5=highest heat
Explain how a disaccharide is formed from 2 monosaccharide molecules, hence explaining the difference in the chemical formulae
A solution is made by mixing equal masses of methanol, CH4O, and ethanol, C2H6O. Determine the mole fraction of each component to at least three significant figures.
determine that the metal ion was a +2 ion, then which metal is it? This metal was used in batteries for a long time (even in "alkaline" batteries) due to its good electrochemical properties, but it is now being phased out. Why?
What products would you expect from the reaction of 1 mol of 1,3-butadiene and each of the following reagents? (If no reaction would occur, indicate that as well.)
Carbon dioxide is removed from the atmosphere of space capsules by reaction with a solid metal hydroxide. Theproducts are water and the metal carbonate
Utilizing a previously prepared beer's curve he determined the connection of his dilution to be .00256 M. Find out the concentration of the original unknown sample
Would you expect the carotenoid pigment fraction to come off sooner or later than it did with 95:5 Hexane:Acetone? What effect would you expect if you used 100% hexane instead
Calculate the final temperature of the solution has a specific heat capacity =4.18 J/°C · g. assuming no heat lost
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