In a carburzing process, an initially 0 2% C steel gear is placed in an atmosphere that provides 1 3% C at the surface of the steel at 1000°C.How long does it take to reach a 0.45% C at a depth of 02 cm below the surface? The preexponential and activation energy are Da = 23 x 105 m?is and Qa = 148000 Jimol diffusion of C in FCC Fe at this temperature.O a 30.2 hoursOb 196 hoursOc 645 hoursOd 71 hoursO e 29 hours

Given data is Cx = 0.45 C0 = 0.2 Cs = 1.3 Activation Energy = 148000 J/mol Pre exponential factor :…

Answered: In a carbunizing process, an initially…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Consider the reaction: A4 (g) + 6B2(g) → 4AB3(g). At a certain instant the initial rate ofdisappearance of B2 is 0.5 M/s. What is the value of the appearance of AB3 at the same instant?
3. In a chronoamperometric experiment the following data are obtained for the reduction of a species whose bulk concentration is 1x103 M and diffusion coefficient is 1x10 cm/sec. (Double layer charging corrections have been made) What information can you derive? State any assumptions made. t(sec.) i(uA) 0.01 164 0.02 0.04 116.1 82.3 0.06 74.14 0.09 71.6 0.16 62.25 0.40 42.2 1.00 34 2.00 24.2 3.00 20.0
The following table gives the volume of nitrogen (reduced to 0°C and 1 bar) adsorbed per gram of active carbon at 0°C at a series of pressures: 1731 P/Pa v/(cm³ g-¹) 524 0.987 3.04 3058 C. 29 cc/g D. 23 cc/g E. None of the choices 5.08 4534 7.04 Determine the volume required to form a monolayer. A. 34 cc/g B. 40 cc/g 7497 10.31
A hypoeutectoid plain-carbon steel that was slow-cooled from the austenitic region to room temperature contains 9.1 wt% eutectoid ferrite. Assume that no change in structure on cooling from just below the eutectoid temperature to room temperature. Calculate the carbon content of the steel. Temperature ( 1000 900 7+ Fe,C 800 a+7 Eutectoid point 0.022 700 600 500- a+FqC 400 0 0.4 100% Fe 0.77 Pearlite Weight percent carbon Fe,C 6.67 1. Let x = the weight percent carbon of the hypoeutectoid steel (shown as a red line). Now, the relation (ratio) between the eutectoid ferrite to the total ferrite and the proeutectoid ferrite is expressed as: [Eutectoid Ferrite] = [Total Ferrite] - [Proeutectoid Ferrite) ... (eq.1) Fill eq.1 by using x. Express with up to 3 significant digits. (NOTE: Please check the rules for significant figures. For example, 0.012 and 1.23 both have 3 significant digits.) [Eutectoid Ferrite]-[1] [Total Ferrite]-[2] [Proeutectoid Ferrite]-[3] *Check the "Question Hint".…
Aluminum atoms are to be diffused into a silicon wafer using both predeposition and drive-in heat treatments; the background concentration of Al in this silicon material is known to be 2.5 x 101⁹ atoms/m³. The drive-in diffusion treatment is to be carried out at 1050°C for a period of 4.0 h, which gives a junction depth x; of 3.0 μm. Compute the predeposition diffusion time at 950°C if the surface concentration is maintained at a constant level of 2 x 1025 atoms/m³. For the diffusion of Al in Si, values of Qd and Do are 3.41 eV and 1.38 x 10-4 m²/s, respectively. min

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