Nylons are strong sythetic fibers commonly used to make clothing and other goods. one of the most common nylons, nylon 66, is made by the condensation reaction between adipic acid and hexamethylenediamine (hexane-1,6-diamine). modify the monomers below to create one repeat unit of the polymer. what other, small molecule is produced in this reaction?

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.