Compounds A and B react to form compounds C and D according to the equation: aA + bB → cC + dD. If the reaction involves intermediates and several steps, the rate law is determined by . A.) measuring the rate of the reaction for different concentrations of A and B

B.) using the coefficients of the reactants as exponents in the rate law expression

C.) measuring the changes in enthalpy and entropy at specific temperatures

D.) adding the coefficients of the reactants (their sum is the specific rate constant)

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.