2. (4 pts) For the reaction 2A+5B3X+8Z, the rate of formation of Z is first orde

Question

2. (4 pts) For the reaction 2A+5B3X+8Z, the rate of formation of Z is first order in B and half-order in A. If the rate constant for this reaction at 25°C is 7.5 x 10 M , what is the rate of disappearance at 25°C of A when the concentration of A is 0.040 M and B is 0.36 M? 3. For the reaction B > products, and an initial concentration of B of 0.10 M and a rate constant at 25°C of 75?/s, where" means the units will depend on the order of the reaction, determine the half- life in seconds if the reaction is a) (3 pts) half-order in B b) pt) first order in B Show each equation for the half-life before computing its value. Now give the half-life in seconds if the initial concentration of B is 0.30 M and the reaction is c) ( pt) half-order in B d) (1 pt) first order in B 4. (4 pts) A reaction that is very slow at body temperature (37°C) may be increased without increasing the temperature by the action of a specific enzyme (examples are carbonic anhydrase and p amylase). Assume that the Arrhenius equation applies and calculate the factor by which the presence of an enzyme which lowers the activation energy of a reaction by 50 kJ increases rate constant (and, hence, the rate). You may assume that the pre-exponential is the same for both rate constants.

Explanation / Answer

Since there are many questions, I'll give thorough explanation on only first question.

2. The rate of reaction (r) = k*[A]1[B]0.5

i.e. r = 7.5*10-4 M-0.5 s-1 * (0.04 M)*(0.36 M)0.5

i.e. r = 1.8*10-5 M s-1

i.e. 1/2 (-d[A]/dt) = 1.8*10-5 M s-1

i.e. -d[A]/dt = 3.6*10-5 M s-1

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.