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- The diameter of the methyl radical is about 308 pm. What is the maximum rate constant in the expression d[C2H6]/dt = kr[CH3]2 for second-order recombination of radicals at 298 K? It is reported that 10 per cent of a sample of ethane of volume 1.0 dm3 at 298 K and 100 kPa is dissociated into methyl radicals. What is the minimum time for 90 per cent recombination?The composition of a liquid phase reaction 2A → B was monitored by aspectrophotometric method with the following results: t, s [B], mol/L 0 0 600 0.089 1200 0.153 1800 0.200 2400 0.230 ∞ 0.312 Identify the rate law, integrated rate law, and rate constant for thereaction based on the obtained data.The rate constant for the reaction 2NO2 → 2NO + O2 is experimentally determined to be 0.153 mol−1 dm3 s −1 at 300°C and 0.993 mol−1 dm3 s −1 at 350°C. Estimate the effective radius of an NO2 molecule. The steric factor for this reaction is 0.05.
- For the reaction NH2SO2OH + H2O → NH4HSO4 In aqueous solution at 80.35oC, the following constants were observed at the indicated ionic strength μ x103 k (L/mol hr) 5.06 1.07 11.21 1.02 15.85 0.976 22.94 0.886 From these data ascertain: a.) the valence of the reacting ions and b.) the rate constant for the primary salt effect.Give clear handwritten answer- Derive an expression for the time dependence of the degree of polymerization (the average number of monomer residues per polymer molecule) for a condensation polymerization in which the reaction is known to have rate law d[M]/dt = -k[M] 3 , where [M] represents the concentration of the monomer!The composition of a liquid phase reaction 2 A → B was followed spectrophotometrically with the following results:t/min 0 10 20 30 40 ∞[B]/(mol dm-3 ) 0 0.372 0.426 0.448 0.460 0.500Determine the order of the reaction and its rate constant
- An enzyme-catalyzed reaction has a Km of 1 mM and a Vmax of 4 nmole/L sec-1. The reaction velocity (nmole/L sec-1) when the substrate concentration is 0.25 mM is: A. 1.25 B. 10.0 C. 5.0 D. 0.50 E. 1.0 F. 100 G. 150 H. 55 I. 75In the dimerization of methyl radicals at 25 °C, the experimentally determined frequency factor is 2.4 × 1010 dm3 mol−1 s−1. What are (a) the reactive cross-section, and (b) the steric factor for the reaction given that the C–H bond length is 154 pm?Consider the reaction of [V(H2O)6]2+ with [Co(NH3)5X]2+ in acidic aqueous solution (X = halide or NCS–) producing [V(H2O)5X]2+ and [Co(H2O)6]2+. Suggest the mechanism, considering that the rate constant is very similar for X = Cl, Br, I. Characterize in few words individual steps. Explain the nature of the rate-determining step in terms of the [V(H2O)6]2+ electron configuration.