Which statement is true of a reversible reaction at equilibrium?
O A. The concentration of reactants is less than the concentration of products.
OB.
The concentration of reactants and the concentration of products are equal.
OC. The concentration of reactants is greater than the concentration of products.
OD.
The concentration of reactants and the concentration of products are constant.
E. The concentration of reactants is decreasing and the concentration of products is increasing.

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?

Write a balanced equation showing the formation of copper (ii) nitrite from its elements

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.