The substitution reactions of molybdenum hexacarbonyl, Mo (CO)6,with a variety of other molecules L are believed to occur by the following mechanism:
(a) What is the overall reaction?
(b) What is the molecularity of each of the elementary steps?
(c) Write the rate law, assuming that the first Step is rate-determining.
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- но HO Но HO co + ½ 0, - + H,O H" H но Он ascorbic acid dehydroascorbic acid Vitamin C is oxidized slowly to dehydroascorbic acid by the oxygen in air. It is catalyzed by ions such as Cu*2 and Fe*3. The reaction can be followed by measuring the ultraviolet absorbance at 243 nm. Time (hours) Absorbance (A) 1/A In A - In A 0.75 1.3 -0.29 0.29 1 0.38 2.6 -0.97 0.97 0.19 5.3 - 1.7 1.7 3 0.095 11 - 2.4 2.4 27. Which of the following is the best interpretation of the data given above? (A) The data support a zero-order reaction. (B) The data support a first-order reaction. (C) The data support a second-order reaction. (D) The overall order is third. 28. A new compound is synthesized and found to be a monoprotic acid with a molar mass of 248 g/mole. When 0.0050 moles of this acid are dissolved in 0.500L of water, the pH is measured as 2.94. What is the pk, of this acid? (A) (В) (C) (D) 2.33 3.89 5.78 7.78 29. What is the hybridization of carbon 1 (far left) and carbon 2 (middle) in this…arrow_forwardwrite the mechanism (synthesis) of this reaction C NC NCarrow_forwardThe activation energy for the gas phase decomposition of acetic anhydride is 144 kJ. (CH3CO)2O → CH₂=C=O + CH3COOH S The rate constant at 493 K is 5.48 x 10-4 s-1. The rate constant will be 0.00745s¹ at K.arrow_forward
- 7. How did the reaction below happen? Use catalytic circle to describe the mechanism, assuming the catalyst is the complex [CpRu(CH;CN);[BAr] Catalyst CO2ME + MeO OMe ċO,Me N2 CH2CI2 (0.5 M) 60 °C, 6 h 1a 2A 3aAarrow_forwardThe addition of NO accelerates the decomposition ofN2O, possibly by the following mechanism:NO(g) + N2O(g)--->N2(g) + NO2(g)2 NO2(g)--->2 NO(g) + O2(g)(a) What is the chemical equation for the overall reaction?Show how the two steps can be added to give theoverall equation. (b) Is NO serving as a catalyst or an intermediatein this reaction? (c) If experiments show thatduring the decomposition of N2O, NO2 does not accumulatein measurable quantities, does this rule out the proposedmechanism?arrow_forwardно HO HO HO 0 + ½ O, → + H,0 H H но он ascorbic acid dehydroascorbic acid Vitamin C is oxidized slowly to dehydroascorbic acid by the oxygen in air. It is catalyzed by ions such as Cu*2 and Fe*3. The reaction can be followed by measuring the ultraviolet absorbance at 243 nm. Time (hours) Absorbance (A) 1/A In A - In A 0.75 1.3 -0.29 0.29 1 0,38 2.6 -0.97 0.97 2 0.19 5.3 - 1.7 1.7 3 0.095 11 - 2.4 2.4 28. A new compound is synthesized and found to be a monoprotic acid with a molar mass of 248 g/mole. When 0.0050 moles of this acid are dissolved in 0.500L of water, the pH is measured as 2.94. What is the pKa of this acid? (A) (B) (C) (D) 2.33 3.89 5.78 7.78 29. What is the hybridization of carbon 1 (far left) and carbon 2 (middle) in this hydrocarbon: CH3CH=CH2? (A) sp³, sp (B) sp?, sp? (C) sp³, sp? (D) sp, sp?arrow_forward
- A reaction has Keq' = 120. The rate constant of this reaction was found to be 1.11x 101s-1. If the catalytic power of an enzyme for this reaction is 1.25 x 10', what is the rate constant, in s1, for the reverse direction of the catalyzed reaction?arrow_forwardThe mechanism for the reaction described by the equation CH,NC(g) CH, CN(g) is suggested to be k1 (1) A(g) + M(g) = A" (g) + M(g) k-1 k2 * (2) А (g) → B(g) where A(g) is CH, NC(g), M(g) is any gas molecule, A* (g) is CH,NC*(g) (an energized gas molecule), and B(g) is CH,CN(g). Assuming that [A* ] is governed by steady-state conditions, derive the rate law for the production of CH, CN(g) in terms of [A], [M], and the appropriate k values.arrow_forwardWhat's the reaction mechanism?arrow_forward
- The enzyme urease catalyzes the reaction of urea, 1NH2CONH22, with water to produce carbon dioxide and ammonia. In water, without the enzyme, the reaction proceeds with a first-order rate constant of 4.15 * 10-5 s-1 at 100 °C. In the presence of the enzyme in water, the reaction proceeds with a rate constant of 3.4 * 104 s-1 at 21 °C. (a) Write out the balanced equation for the reaction catalyzed by urease.arrow_forwardA study of the rate of dimerization of C4H6 gave the data shown in the table: 2C4H6→C8H12 Time (s) [C4H6] (M) 0 1.00 x 10–2 1600 5.04 x 10–3 3200 3.37 x 10–3 4800 2.53 x 10–3 6200 2.08 x 10–3 What is the instantaneous rate of dimerization at 3200 s? Create a graph of time versus [C4H6] to help answer this question. Question 1 options: a) 9.4 x 10-7 M s-1 b) 8.2 x 10-7 M s-1 c) 7.7 x 10-7 M s-1 d) 6.5 x 10-7 M s-1arrow_forwardI'm not really sure how to approach this problem. I thought you could substitute the half life equation into the integrated equation for first order reactions, but that didn't work.arrow_forward
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