Temperature effect on the degradation of a multisulfa preparation was evaluated at 60 and 70°C. If the first-order reaction rate constants responsible for the degradation at these two temperatures were 8.2 x 10-4 and 1.96 x 10-3 hr-1,   Calculate the activation energy, Ea, for this drug in this temperature range (in kcal/mole). (The gas constant; R = 1.987 cal/deg mole):

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Help on these two please

If the y-axis of the graph changes to “volume of hydrogen / cm3 ”, sketch this rate curve. What will be the effect on the reaction rate if the concentration of HCl changes from 0.1 M to 0.2 M? Explain

- 1 - 1 At a certain temperature this reaction follows second-order kinetics with a rate constant of 32.5M •S : NH,ОH (аq) -- Nн; (ад) +н,о (аq) Suppose a vessel contains NH,OH at a concentration of 0.910M. Calculate the concentration of NH,OH in the vessel 0.120 seconds later. You may assume '4 no other reaction is important. Round your answer to 2 significant digits. OM x10

The activation energy for the gas phase decomposition of acetic anhydride is 144 k). (CH3CO)20→CH2=C=0 + CH3COOH The rate constant at 502 K is 9.94x10 4/s. The rate constant will be 9.74x10 3/s at K.

Question No., 4: The homogeneous dimerization of butadiene: 2C,Hs(g) = C8H12(g), has been studied by a number of investigators and found to have an experimental activation energy of 23960 cal/ mol, as indicated by the following equation: k = 9.2 x 10°e-23960/RT cm³mol-'s-1 a. What proportion of the collisions between C4H6 molecules have enough energy to result in reaction when the temperature is 200°C? b. Use the collision theory to predict a value of the pre-exponential factor (in SI units) at 600 K. Assume that the collision diameter is 5 x 10-°cm. c. By how many times the calculated value of the pre-exponential factor is greater than the experimental value? Suggest a reason for this discrepancy.

For a drug to be effective in treating an illnens, its levels in the bloodstream must be maintained for a period of time. One way to measure the level of a drug in the body is to measure its rate of appearance in the urine. The rate of excretion of penicillin is first order, with a half-life of about 30. min. If a person receives an injecction of 21 mg of penicillin at t- 0, how much penicillin remains in the body after 3.0 hours? mg