If a gas is initially at 5.50 atm, 121l, 293k,
then it changes to 5.15 atm and 298k, what is the new volume?

What shape would a molecule with two bound groups and two lone pairs have?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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.