A small patch of a catalyst surface is known to have 9 accessible adsorption sites for atoms, where only one atom can bind at each site. What is the configurational entropy, S, when two Ar atoms absorb on this patch of the surface? Give your answer to three significant figures. A) 5.91 x 10-23 J/K B) 3.99 x 10-23 J/K C) 6.07 x 10-23 J/K D) 3.03 x 10-23 J/K E) 4.95 x 10-23 J/K

Which steps are involved in a bimolecular heterogeneous catalytic reaction: A(g) +B(g) →P following Langmuir-Hinshelwood mechanism? Choose the best answer. Adsorption of gas molecules of A and B on the catalyst surface Surface reaction between adsorbed molecules of A and adsorbed molecules of B Desorption of product molecules from the catalytic surface All of the above

2. The prep team for our course has prepared a 0.1 mg/mL stock of BPB solution. To get an absorbance reading near 1 on our spectrophotometer, we need to make a 12.5 µg/mL solution. We need 1 mL of this 12.5 ug/mL BPB for our experiment. How many microliters of 0.1 mg/mL BPB solution and how many microliters of water must we combine? Show your work below. Pay attention to your units!

The decomposition of NO into N2 and O2 occurs via elementary steps consisting of: (1) quasi-equilibrated molecular adsorption of NO; (2) irreversible dissociation of adsorbed NO by interaction with a neighboring free site; (3) irreversible recombination of adsorbed N atoms to form N2; and (4) quasi-equilibrated desorption of adsorbed O atoms to form O2.The reaction is catalyzed within porous catalytic pellets of slab geometry (thickness = 2L). Write the mechanism of the reaction with the stoichiometric number of each step.  Derive the rate expression in terms of constants and measurable quantities, assuming O* is the MARI/MASI.

The decomposition of NO into N2 and O2 occurs via elementary steps consisting of: (1) quasi-equilibrated molecular adsorption of NO; (2) irreversible dissociation of adsorbed NO by interaction with a neighboring free site; (3) irreversible recombination of adsorbed N atoms to form N2; and (4) quasi-equilibrated desorption of adsorbed O atoms to form 02. The reaction is catalyzed within porous catalytic pellets of slab geometry (thickness = 2L). a) Write the mechanism of the reaction with the stoichiometric number of each step. b) Derive the rate expression in terms of constants and measurable quantities, assuming O* is the MARI/MASI. c) The steady-state condition for the porous slab is shown below (A=NO): Саб Bulk BL CATALYS SLAB BL Bulk CAB2 САБ At high oxygen pressures, the concentration of oxygen can be assumed as constant and lumped into the rate constant, leaving the reaction rate as first order in (NO). Assume that the internal effectiveness factor in the catalyst slab is 0.2.…

This problem is (11.16) from a book  "Thermodynamics and Statistical Mechanics An Integrated Approach by M. Scott Shell"

What does the activity coefficient tell us about the nature of the interactions present between the constituents in the liquid phase, and how is this related to the excess Gibbs energy.

Which of the following term/s is/are true about tacticity? i. Tacticity affects the degree of crystallinity. ii. Tacticity is a polymer property that occurs as a result of chain length and chain structure. iiI. An isotactic polymer shows greater resistance to dissolve in solvents than its atactic and syndiotactic forms. iv. An atactic polymer is melted at higher temperatures than its isotactic and syndiotactic forms. v. When an isotactic polymer is melted, it shows higher melt viscosity than its atactic and syndiotactic forms. I, II, II, Nand V A I, Ill and V III, VandV NandV

4. If a polymer chain has a molecular weight of 280,000, how many ethylene units does it contain? Answer:

Why does Cp spike at Tm(the point where the solid and liquid) for aliphatic chains under thermotrophic changes when changing from solid to liquid