20. Gabriel is determined to find the density of an unknown, irregularly shaped object. Using a digital scale to get the mass and the displacement method to get the volume, he records the following data: (6 points) Mass-19.37 g Initial volume-50.00 mL Final volume- 61.94 mL What is the density of the unknown object? PLEASE SHOW YOUR WORK!​

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.