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Benzoyl peroxide, the substance most widely used against acne, has a half-life of 9.8 103 days when refrigerated. How long will it take to lose 7% of it potency (93% remaining)?
Experiment shows the reaction 5 Br(aq) - + BrO3-(aq) + 6 H+(aq) 3 Br2(l) + 3 H2O(l) as it obeys this rate law: Rate = k[Br- ][BrO3- ][H+]2. What are the reaction orders in each reactant and the overall reaction order? (Separate reactant orders by a single comma, for example, 1,2 means that the first reactant has a order of 1 and the second reactant has a order of 2.)
the decomposition of N2O5 in carbon tetrachloride proceeds as follows: 2 N2O5 -> 4 NO2 + O2. The rate law is first order in N2O5. At 64 degree celcius the rate constant is 4.82 x 10^ 3 s ^ -1.
Then 40.0 mL of this solution were titrated with 0.060 M HClO4. Calculate the pH at the first equivalence point.
What two aqueous reactants might you combine to give a barium sulfate precipitate? Write the molecular equation for the reaction that would result.
One mole of water vapor is expanded reversibly from 5L to 15L at a temperature of 800K. Calculate q, w, deltaE for this process assuming that water behaves as a van der Waals gas,
What is the lead concentration of a saturated solution of lead(II) sulfate containing 0.010 molar Na2SO4
Write the reaction with water that is the ionization of propionic acid to propionate, draw this out in two ways. First with expanded structures, of course, all atoms and all bonds.
a weather ballon filled with helium has a volume of 1.0*10^-4L at 1.00 atm and 30.0C. it ascends to an altitude at which the pressure is only 0.60 atm and the temperature is -20.0C. what is the volume of the ballon at the higher altituda.
write the expression for the base dissociation constant for hydrazine, N2H4, a weak base. Hydrazine reacts with water to form the N2H5+ ion.
A precipitate of calcium phosphate is in contact with 653.9 mL of water. How many grams of calcium ion are present in the solution
Would you expect a Diels-Alder reaction between maleic anhydride and naphthalene to require more or less harsh conditions
Fifty percent of that sunlight is captured by the collector and heats the water flowing through it. What would be the temperature rise of the water as it leaves the collector?
Large quantity of ammonia are burned in the presence of platinum catalyst to give nitric oxide as d first step in the preparation of nitric acid.
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