The activation energy for diffusion (Qa) is 80 kJ/mol for carbon diffusing into a-iron. If the Do value is assumed constant, what is the ratio of the diffusion coefficient (D) at 800°C to 500°C? Note: pay attention to units and recall that the ideal gas constant (R) is 8.314 J/mol-K. a. 0.03 b. 32.5 C. 1362 d. 0.0007

The activation energy for diffusion (Qa) is 80 kJ/mol for carbon diffusing into a-iron. If the Do value is assumed constant, what is the ratio of the diffusion coefficient (D) at 800°C to 500°C? Note: pay attention to units and recall that the ideal gas constant (R) is 8.314 J/mol-K. a. 0.03 b. 32.5 C. 1362 d. 0.0007

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter34: Miscellaneous Separation Methods

Section: Chapter Questions

Problem 34.14QAP

See similar textbooks

Similar questions

Arrange the gases CO, N2 and CH4 in increasing order of adsorption on the surface of charcoal in a closed vessel. Give reasons also.
A layer of 10.0 g of iodine is spread uniformly over a surface of area 10.0 cm2 and covered in hexane. What will be the molar concentration of iodine molecules at 5.0 cm above the original layer after (i) 10 s, (ii) 24 h? Assume diffusion is the only transport process, take D = 4.05 × 10−9 m2 s−1, and assume that the layer of hexane in infinitely deep.
A monolayer of CO molecules is adsorbed on the surface of 1.00 g of an Fe/AI2O3 catalyst at 77 K, the boiling point of liquid nitrogen. Upon warming, the carbon monoxide occupies 4.25 cm3 at O oC and 1.00 bar. What is the surface area of the catalyst?
1.At -185°C and 1 atm ethane (MW = 30.07 g/mol) exists as a solid with a FCC structure. Using the data provided below: E/k=194.1K, bo=0.1794 m3/kmol Determine the diameter of one molecule of ethane (in angstroms). 2. What is the void fraction? 3. Find the density of the solid etahne. 4. Calculate the distance of separation (in m) between two ethane molecules when the potential energy is at a minimum. 5. At the separation distance calculated in part (4), determine the minimum value of the potential energy between two molecules (in J).
In an experiment carried out at a temperature of 4700C and a pressure of 100 atmosphere, 4.3g of a volatile liquid produced 30.6cm3of the gas. Calculate the molar mass of the liquid. (Molar gas constant, R= 8.314JKmol, molar gas volume at stp = 22400cm3, 1 atmosphere= 1.0 x 10 Nm-2)
What is the diffusion coefficient of a membrane-bound protein of molar mass 79,300 daltons at 37°C if the viscosity of the membrane is 1 poise (0.10 N-s-m-2)? Assume that this protein is an unhydrated, rigid sphere that has a density of 1.4 g-cm-3. 4.0 8.05e-12 x m².s-1 What is the average distance traveled by this protein in 2.3 s? 4.0 6.085e-6 x Å
Relate Graham's Law of Effusion and Diffusion to the cell membrane's semi-permeability. Explain the mechanism how the said law affects the transport within and among the cells. Draw a simple diagram that clearly shows the mechanism.
A container of internal volume 22.0 m3 was punctured, and a hole of radius 0.050 mm was formed. If the nitrogen pressure within the container is initially 122 kPa and its temperature 293 K, how long will the pressure take to fall to 105 kPa assuming that the temperature is held constant?
The diffusion coefficient of valine in water at 298 KKis 0.831×10−9m2⋅s−10.831×10−9m2⋅s−1. Determine the time it will take a valine molecule on average to diffuse an rms distance of 2.00. If the molecular diameter of valine is taken to be 0.300 nmnm, what is the time per random walk step?
Early attempts to coat metals with Teflon, poly tetrafluoroethylene, resulted in a polymer layer that peeled off the surface easily. Later attempts gave coatings that were much more durable. What type of adsorption processes are being manifested in either situation? What technical problem had to be solved in order to develop durable coatings?
The diffusion coefficient of CCl4 in heptane at 25 °C is 3.17 × 10−9 m2 s−1. Estimate the time required for a CCl4 molecule to have a root mean square displacement of 5.0 mm.
Rationalise what adding Na2O (a network modifier) to B2O3 does to the structure of the glass. Begin by sketching the influence of Na(+) and O(2-) on the SRO of the glass to predict the observed changes to MRO and associated bulk properties. If you like, comment on the changes to the dynamics (eg. vibrations) in the glass after modification.