Several thin sheets of naphthalene, 0.25 cm thick and 10 cm2square, are arranged parallel to each other with their centers at 1 cm intervals. air at 273 k and 1.013 x 105 pa enters this sandwich arrangement with a bulk velocity of 15 m/s. at 273 k, the mass diffusivity for naphthalene in air is 5.14 x 10-6 m/s, the schmidt number is 2.57, and the vapor pressure of naphthalene is 1.0 pa. determine the concentration of naphthalene in the air as it leaves the arrangement, evaluating the mass-transfer coefficient using the a) reynolds analogy: b) von karman analogy; c) chilton-colburn analogy

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining

Is this correct if not can u correct me

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.