In order to understand the prehistory of the hawaiian island of lana'i better, anthropologists maria sweeney, melinda allen, andboyd dixon used radiocarbon dating on charcoal found in an ancient dwelling site, the kaunolu village national historic landmark, the largest archeological complex on the island. in one of their samples, they found that approximately 94% of the original carbon 14 remained. using the fact that carbon 14 decays by 1.202% every 100 years, determine the approximate age of this sample.

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

Which of these conditions most likely produces an unstable isotope?

How many absorptions would you expect to observe in the 13c nmr spectra of the following molecules? a) 3-chloropentane b) cis-4-methyl-2-pentene