Study the balanced chemical reaction.

H2 + O2 → H2O2
(M H2 = 2.02 g/mol; M H2O2 = 34.02 g/mol)

If 100.0 g of hydrogen peroxide (H2O2) is produced, what percent of the product is hydrogen?

A) 50.0% is hydrogen.
B) 94.1% is hydrogen.
C) 5.94% is hydrogen.
D) 12.5% is hydrogen.

Modern weaponry has increased the number of deaths in wars and violent conflicts.

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 best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium