Chromatograph a mixture of three compounds: naphthalene, toluic acid and fluorenol, through an alumina column eluted with a solvent system based on hexanes which becomes more polar with the addition of more and more dicholomethane over tme. a. True
b. False

Which of the following pressures is equal to 760 mm hg? 2.0 atm 101.3 pa 101,300 kpa 101,300 pa

Aside from human impact, which of the following causes less water vapor production over a small area? (2 pderivartin

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.