EBK THERMODYNAMICS: AN ENGINEERING APPR
8th Edition
ISBN: 8220102809444
Author: CENGEL
Publisher: YUZU
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Chapter 16.6, Problem 37P
(a)
To determine
The amount of heat transfer for the dissociation of Oxygen is
(b)
To determine
The amount of heat transfer for the absence of dissociation of Oxygen.
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An iron-carbon alloy initially containing 0.268 wt% C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1040°C.
Under these circumstances the carbon diffuses from the alloy and reacts at the surface with the oxygen in the atmosphere; that is, the
carbon concentration at the surface position is maintained essentially at 0.0 wt% C. At what position will the carbon concentration
be 0.201 wt% after a 7 h treatment? The value of D at 1040°C is 2.5 × 10-¹1 m²/s.
erf(z)
erf(z)
0.55 0.5633 1.3
0.025 0.0282 0.60 0.6039 1.4 0.9523
0.0564 0.65 0.6420 1.5
Z
0.00
0.05
0.15
0.0000
0.10 0.1125 0.70 0.6778
0.20
Z
0.1680 0.75 0.7112 1.7
0.2227 0.80 0.7421 1.8
0.45 0.4755 1.1
0.50 0.5205
Z
1.6
1.2 0.9103
erf(z)
0.9340
2.8
0.9661
0.25 0.2763 0.85 0.7707 1.9 0.9928
0.30 0.3286 0.90 0.7970
2.0 0.9953
0.35 0.3794 0.95 0.8209 2.2
0.40 0.4284 1.0
0.8427 2.4
0.9763
0.9838
0.9891
0.9981
0.8802 2.6 0.9998
0.9993
0.9999
An FCC iron-carbon alloy initially containing 0.35 wt% C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1400 K (1127°C). Under these circumstances the carbon diffuses from the alloy and reacts at the surface
with the oxygen in the atmosphere; that is, the carbon concentration at the surface position is maintained essentially at 0 wt% C. (This process of carbon depletion is termed decarburization.) At what position will the carbon concentration he 0.15 wt% after a 10-h treatment? The value of D at 1400 K is 6.9 x 10m²'s
An FCC iron–carbon alloy initially containing 0.35wt% C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1450K (1177 degree C). Underthese circumstances the carbon diffuses from the alloy and reacts at thesurface with the oxygen in the atmosphere; that is, the carbon concentration atthe surface position is maintained essentially at 0 wt% C. (This process ofcarbon depletion is termed decarburization.) At what position will thecarbon concentration be 0.15 wt% after a 15-h treatment? The value of D at1400 K is 6.9 x 10^(-11)m^2/s.
Chapter 16 Solutions
EBK THERMODYNAMICS: AN ENGINEERING APPR
Ch. 16.6 - Write three different KPrelations for reacting...Ch. 16.6 - A reaction chamber contains a mixture of CO2, CO,...Ch. 16.6 - A reaction chamber contains a mixture of N2and N...Ch. 16.6 - A reaction chamber contains a mixture of CO2, CO,...Ch. 16.6 - Which element is more likely to dissociate into...Ch. 16.6 - Prob. 6PCh. 16.6 - Prob. 7PCh. 16.6 - Prob. 8PCh. 16.6 - Prob. 9PCh. 16.6 - Prob. 10P
Ch. 16.6 - Prob. 11PCh. 16.6 - 16–12 Determine the temperature at which 5 percent...Ch. 16.6 - 16–12 Determine the temperature at which 5 percent...Ch. 16.6 - Prob. 14PCh. 16.6 - Prob. 15PCh. 16.6 - Prob. 16PCh. 16.6 - Prob. 17PCh. 16.6 - Prob. 18PCh. 16.6 - Prob. 19PCh. 16.6 - Prob. 20PCh. 16.6 - Prob. 21PCh. 16.6 - Determine the equilibrium constant KP for the...Ch. 16.6 - Prob. 24PCh. 16.6 - Carbon monoxide is burned with 100 percent excess...Ch. 16.6 - Prob. 27PCh. 16.6 - Prob. 28PCh. 16.6 - Prob. 29PCh. 16.6 - Prob. 30PCh. 16.6 - Prob. 31PCh. 16.6 - A mixture of 3 mol of N2, 1 mol of O2, and 0.1 mol...Ch. 16.6 - Prob. 33PCh. 16.6 - Prob. 34PCh. 16.6 - Prob. 35PCh. 16.6 - Prob. 37PCh. 16.6 - Estimate KP for the following equilibrium reaction...Ch. 16.6 - Prob. 40PCh. 16.6 - What is the equilibrium criterion for systems that...Ch. 16.6 - Prob. 42PCh. 16.6 - Prob. 43PCh. 16.6 - Prob. 44PCh. 16.6 - Prob. 48PCh. 16.6 - Prob. 51PCh. 16.6 - Prob. 52PCh. 16.6 - Prob. 53PCh. 16.6 - Prob. 54PCh. 16.6 - Prob. 55PCh. 16.6 - Prob. 56PCh. 16.6 - Prob. 57PCh. 16.6 - Prob. 59PCh. 16.6 - Prob. 60PCh. 16.6 - Prob. 61PCh. 16.6 - Prob. 62PCh. 16.6 - Using the Henrys constant data for a gas dissolved...Ch. 16.6 - Prob. 65PCh. 16.6 - Prob. 66PCh. 16.6 - Prob. 67PCh. 16.6 - Prob. 68PCh. 16.6 - Prob. 69PCh. 16.6 - Prob. 70PCh. 16.6 - Prob. 71PCh. 16.6 - Prob. 72PCh. 16.6 - An oxygennitrogen mixture consists of 30 kg of...Ch. 16.6 - Prob. 74PCh. 16.6 - Prob. 75PCh. 16.6 - Prob. 76PCh. 16.6 - Prob. 77PCh. 16.6 - An ammoniawater absorption refrigeration unit...Ch. 16.6 - Prob. 79PCh. 16.6 - Prob. 81PCh. 16.6 - Prob. 82PCh. 16.6 - Prob. 83RPCh. 16.6 - Prob. 84RPCh. 16.6 - Prob. 85RPCh. 16.6 - Consider a glass of water in a room at 25C and 100...Ch. 16.6 - Prob. 87RPCh. 16.6 - 16–90 Propane gas is burned steadily at 1 atm...Ch. 16.6 - Prob. 91RPCh. 16.6 - Prob. 92RPCh. 16.6 - Prob. 93RPCh. 16.6 - Prob. 94RPCh. 16.6 - Prob. 95RPCh. 16.6 - A constant-volume tank contains a mixture of 1 mol...Ch. 16.6 - Prob. 101RPCh. 16.6 - Prob. 103RPCh. 16.6 - Prob. 104RPCh. 16.6 - Prob. 107RPCh. 16.6 - Prob. 108RPCh. 16.6 - Prob. 109FEPCh. 16.6 - Prob. 110FEPCh. 16.6 - Prob. 111FEPCh. 16.6 - Prob. 112FEPCh. 16.6 - Prob. 113FEPCh. 16.6 - Prob. 114FEPCh. 16.6 - Propane C3H8 is burned with air, and the...Ch. 16.6 - Prob. 116FEPCh. 16.6 - Prob. 117FEPCh. 16.6 - The solubility of nitrogen gas in rubber at 25C is...
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