2NH3 + MgSO4 +2H2O —> Mg(OH)2 + (NH4)2SO4 Using the chemical equation above answer the following questions.

1) If I have 4.2 moles of MgSO4 and 5.4 moles of NH3 which one is the limiting reactant?

2) What is the greatest amount of Mg(OH)2 that can be made with 4.6 moles of MgSO4 and 5.4 moles of NH3?

3) How many moles of the excess reactant is left over after the reaction has been completed?

Type the letter that represents the correct location for each particle type below.

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.

Which one of the following bonds would you expect to be the most polar? a) b–h b) n–h c) p–h d) al–h e) c–h