In an enzyme-catalyzed 1st order process, a substrate has a half-life of 138 seconds. How long will it take for the substrate concentration to drop to 0.040 mmol/L if the beginning concentration is 1.28 mmol/L?

A different beta blocker is eliminated by a second-order process with a rate constant of 7.6x10-3 min-1. A patient is given 10. mg of the drug. What mass of the drug (in mg) remains in the body 5.0 hours after administration?

Enrofloxacin is a drug used for dogs and cats to combat bacterial infections.A dog was given an intramuscular injection of enrofloxacin, and just after the injection, the initial concentration of the drug in the dog’s blood was 5.8Í10–6 M. If the enrofloxacin disappears in a first-order process with a half-life of 4.6 hours, how many hours will it take for the enrofloxacin concentration of drop to one-eighth (1/8th) of the initial concentration (i.e., 0.125[A]0)?

In aqueous solution buffered at a pH of 6.75 Penicillin G (molecular weight of 334.39 g/mole) undergoes hydrolysis via a pseudo first order reaction that has an activation energy of 77.3 kJ/mole and a pseudo first order rate constant of 1.58 x 10-7 s-1 at 30°C. What is the half life (in days) of Penicillin G under the conditions described?

In a particular dating method, optically active proteins in organic material racemerize over time according to first-order kinetics. D--> L. Calculate the rate of this reaction if 10% of the D is transformed in 175 years.

2. Variation of the rate constant with temperature for the first-order reaction 2 N2O5(g) 2 N204(g) + O2(g) is given in the table below. Show your plot and determine the activation energy of the reaction. T (К) 273 IA k (s') 7.87 x 103 3.46 х 105 4.98 x 106 х 107 298 318 338 4.87

Can you explain step by step?

A reaction A+ B → C + D follows a pseudo-first-order kinetics when the amount of B is maintained as a constant. The half-life time for this reaction is 65.6 hours. If you start with 6.06 mg of A, how many mg of A will be remained after 43.3 hours?

The rate at which a certain drug is eliminated by the body follows first-order kinetics, with a half life of 73 minutes. Suppose in a particular patient the concentration of this drug in the bloodstream immediately after injection is 1.1 ug/mL. What will the concentration be 365 minutes later? Round your answer to 2 significant digits. ug x10 mL ?

Give the characteristic of a first order reaction having only one reactant. The rate of the reaction is not proportional to the concentration of the reactant. The rate of the reaction is proportional to the square of the concentration of the reactant. The rate of the reaction is proportional to the square root of the concentration of the reactant. The rate of the reaction is proportional to the natural logarithm of the concentration of the reactant. The rate of the reaction is directly proportional to the concentration of the reactant.