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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.)
Calculate the integral of dqrev / T for each of the 4 steps in the Carnot cycle of, and sum them to prove that their sum equals zero
assuming no heat loss, and that the specific heat (capacity) of water is 4.184 J/g*K, what is the heat capacity of the copper in J/K?
calculating the pH of the final solution at equivalance point. Please show a step-by-step process
For drug development, it is crucial to optimize the half-life of elimination of the drug so that the drug has long enough to act but not enough time to cause harmful side-effect.
Calorimetry is a method used to measure enthalpy, or heat, changes that occur during chemical processes. Two common calorimeters are constant-pressure calorimeters and constant-volume (or "bomb") calorimeters
The Henry's Law constant (k) for carbon monoxide in water at 25ºC is 9.71 x 10-4 mol/(L•atm). How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?
A system absorbs 192 kj of heat and the surroundings do 120 kj of work on the system. what is the change in internal energy of the system
Protein Quatification IS your spectrophotometer accurate? In other words,is the absorbance response it gives to your at A280 correct?
How many moles of nitrate ions are present in a sample that contains 4.82 moles of chromium(III) nitrate, Cr(NO3)3
For the following reaction: 2A + B + C --> 3P If the rate of disappearance of A ((delta)A/(delta)t) is -0.77 mol/(L s), what is the rate of appearance of P in mol/(L s)?
Show all of your work for each of the following problems. An aluminum nail of mass 5.00g is immersed into a solution of copper(II)nitrate. How many grams of elemental copper can be produced from the reaction
the mechanism to convert 9-fluorenol to 9-methoxy fluorene using a nucleophilic substitution reaction with H2SO4 and methanol.
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