How many molecules of H2O are produced from 6.23g of C2H6 in the following reaction
2C2H6 + 7O2 —> 4CO2 + 2H2O

Answer asap need by wednesday morning calculate the ph of 0.036m naoh best answer will be brainliest

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n

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.