P17B.11 The composition of a liquid phase reaction 2 A → B was monitored by a spectrophotometric method with the following results: t/min 10 20 30 40 [B]/(moldm) 0.089 0.153 0.200 0.230 0.312 Identify the order of the reaction with respect to A and calculate its rate constant.
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- Suppose that the typical diffusion coefficient for a reactant in aqueous solution at 25 °C is 5.2 × 10−9 m2 s−1. If the critical reaction distance is 0.4 nm, what value is expected for the second-order rate constant for the diffusion-controlled reaction?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?A typical diffusion constant for small molecules in aqueous solution at 25 °C is 6 × 10−9 m2 s−1. If the critical reaction distance is 0.5 nm, what value is expected for the second-order rate constant for a diffusion-controlled reaction?
- A wet pipette was used to transfer 10.00 mL of 1M HNO3 in the determination of ΔHrxn. [magnitude of ΔHrxn] In a maximum of 3 sentences explain why ΔHrxn decreases.The Lineweaver-Burke equation of a reaction is 1/v = 0.3 (1/s) + 0.2.Question: What's the Vmax of the reaction?The adsorption equilibrium isotherm for aqueous phenol solution and activated carbon can be determined from the following data: c kg phenol/m3 solution q kg phenol/kg carbon 0.3220 0.150 0.1170 0.122 0.0390 0.094 0.0061 0.059 0.0011 0.045 Determine the appropriate isotherm for this experimental run
- 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!Briefly explain the techniques of catalyst characterization: c) FT-IR of solids with pyridine adsorbed) XRD in the analysis of a catalystliquid phase reaction:trityl (A) + methanol (B) -> product a batch reactor was carried out at 25°C in excess solution (Cb0 = 0.5 mol/dm^3). The pyridine reacts with HCL, which then precipitates as pyridine hydrochloride making the reaction irreversible. the order of the reaction with respect to the methanol concentration (B) is order 1. The concentration of triphenyl methyl chloride (A) is measured as a function of time and is shown below. -ra = kCa x Cb it is assumed that the value of Cb is almost always constant, or Cb = Cb0-rA = kCb0 x CA^x-rA = k1 x CA^x use the integral method to ensure that the reaction is second order with respect to triphenyl methyl chloride
- The following results were obtained for the action of an ATPase on ATP at 20.°C, when the concentration of the ATPase was 20. nmol·dm−3. [ATP]/(µmol·dm−3) 0.60 0.80 1.4 2.0 3.0 v/(µmol·dm−3·s−1) 0.90 1.10 1.48 1.72 1.99 Evaluate the Michaelis constant and the maximum velocity of the reaction. KM = ? vmax = ?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 constantAlthough there are accurate graphical methods available for determining Vmax and Km of an enzyme-catalyzed reaction, sometimes these parameters can be quickly estimated by examining the values of Vo as [S] increases. Estimate the values of Vmax and Km of the reaction catalyzed by an enzyme in which the following data were obtained: