A piece of sodium metal reacts completely with water according to the reaction:

2Na(s) + 2H2O(l) + 2NaOH(aq) + H2(9)

The hydrogen gas is collected over water at 25°C. The volume
of the gas generated is 246 mL at 760.0 mmHg.
Calculate the volume of dry hydrogen gas that would be
collected at STP.
ml H2

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane

Avariable that is not being directly tested during an experiment should be

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.