Triacylglycerols, with their hydrocarbon-like fatty acids, have the highest energy content of the major nutrients. Answer the questions about energy reserves in adipose tissue. Assuming that 15% of the body mass of a 70.0 kg adult consists of triacylglycerols, calculate the total energy reserve, in units of kilojoules and kilocalories, that is available from triacylglycerols.

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.