Please help me I can’t figure it out 1. Calculate the wavelength of light with a frequency of 1.89 x 1018 Hz.
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If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

What is the subscript for oxygen in its molecular formula

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.