1. Derive the Langmuir adsorption isotherm expression for the unimolecular decomposition reaction. Caluculate the equilibrium constant "K" for this process when the coverage of 0 (ads) is 0.5 at pressure of 03 is 1.0 atm.
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- Confirm that the following CO adsorption data on activated carbon at 273 Kfollow the Langmuir or Freundlich isotherm and determine the volumecorresponding to the complete coverage of the surface.Briefly explain the techniques of catalyst characterization: c) FT-IR of solids with pyridine adsorbed) XRD in the analysis of a catalystFor 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.
- Benzene on graphite follows the Langmuir isotherm. At a pressure of 1 atm, theThe volume of benzene adsorbed on a sample of graphite was 4.2 mm3 atconditions T = 0°C and 1 atm. At 3 atm it was 8.5 mm3. Suppose 1 molecule ofbenzene occupies 30Å and estimate the surface area of graphite.please help me answer my assignment. thanks the rate constants (k) for the leaching of galena in an aqeous medium containing ammonium acetate under oxygen pressure at the different temperature are listed below: log K -10.9 -11.1 -11.2 -11.5 -12.1 -12.6 1/t x10^3 2.30 2.35 2.38 2.45 2.61 2.76 where k and T are expressed in mole^2/cm/min and K respectively. Calculate the activation energy of the leaching processIn this table the Kr volume adsorbed on an active carbon surface are given, as a function of the pressures, at 193.5 K. a) Does this data fit well to a Langmuir isotherm? If yes, determine vm and b.
- What is the activation energy (Qv) in eV/atom for a vancay formation if 10 moles of a metal has 2.3x10 ^ 13 vacancies at 425 C?The adsorption of a gas is described by the Langmuirisotherm with a= 1.85 kPa-1 at 25 oC. Calculate the pres-sure at which the fractional surface coverage is (a) 0.10 and (b) 0.90.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. 75
- The pseudofirst-order rate constant for the decomposition of urea, CO(NH2)(aq) + 2 H2O(I)→ 2 NH4+(aq) + CO32-(aq). is 1.2 x 10-7 s- 1 at 60 °C and 4.6 x 10-7 s-1 at 70 oc. Estimate (a) the activation Gibbs energy and (b) the entropy of activa tion of the reaction.Suppose it is known that ozone adsorbs on a certain surface in accord with a Langmuir isotherm. How could you use the pressure dependence of the fractional coverage to distinguish between adsorption (i) without dissociation, (ii) with dissociation into O + O2, (c) with dissociation into O + O + O?(a) Most commercial heterogeneous catalysts are extremelyfinely divided solid materials. Why is particle sizeimportant? (b) What role does adsorption play in the actionof a heterogeneous catalyst?