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For enthalpy 2 going in the heater, the result is -0.15 kj/mol air.  How was this obtained?

For enthalpy 2 going in the heater, the result is -0.15 kj/mol air.  How was this obtained?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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For enthalpy 2 going in the heater, the result is -0.15 kj/mol air.  How was this obtained?  

||! PDF Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + 58°F Sunny File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf Draw T Read aloud 500 (---) T 1000 (-) 652 APPENDIX B Physical Property Tables Q Search A 0 ← → 0.000734 Ĥ 1878 2293 3021 Û 1791 2169 2765 0.001726 0.002491 0.005112 1798 2051 2316 2594 1653 1888 2127 2369 0.001446 0.001628 0.001893 0.002246 0.002000 672 of 695 0.000000 2723 2529 0.003882 U.VIVZ TABLE B.9 Specific Enthalpies of Selected Gases: U.S. Customary Units H OP TABLE B.8 Specific Enthalpies of Selected Gases: SI Units Ĥ (kJ/mol) Reference state: Gas, Pref= 1 atm, Tref = 25°C CO CO₂ H₂O Air 0₂ -0.72 -0.73 0.00 N₂ -0.73 H₂ -0.72 0.00 0 -0.73 -0.92 -0.84 25 0.00 0.00 0.00 0.00 0.00 100 2.19 2.24 2.19 2.16 2.19 2.90 2.54 200 5.15 5.31 5.13 5.06 5.16 7.08 6.01 300 8.17 8.47 8.12 7.96 8.17 11.58 9.57 13.23 17.01 400 11.24 11.72 11.15 10.89 11.25 16.35 500 14.37 15.03 14.24 13.83 14.38 21.34 600 17.55 18.41 17.39 16.81 17.57 26.53 20.91 700 20.80 21.86 20.59 19.81 20.82 31.88 24.92 800 24.10 25.35 23.86 22.85 24.13 37.36 29.05 900 27.46 28.89 27.19 25.93 27.49 42.94 33.32 1000 30.86 32.47 30.56 29.04 30.91 48.60 37.69 1100 34.31 36.07 33.99 32.19 34.37 54.33 42.18 1200 37.81 39.70 37.46 35.39 37.87 60.14 46.78 1300 41.34 43.38 40.97 38.62 41.40 65.98 51.47 1400 44.89 47.07 44.51 41.90 44.95 71.89 56.25 1500 48.45 50.77 48.06 45.22 48.51 77.84 61.09 V.VIIT 3248 3439 2946 3091 0.006112 0.007000 2857 2591 0.002668 V.VIZU 3105 2795 0.003106 CVIJO 3610 3224 0.007722 3324 2971 0.003536 VUITT 3771 3350 0.008418 3526 3131 0.003953 {" Ⓡ J 63 50 D ENG Sign in (0) + 0 7:53 AM 5/22/2023
Transcribed Image Text:||! PDF Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + 58°F Sunny File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf Draw T Read aloud 500 (---) T 1000 (-) 652 APPENDIX B Physical Property Tables Q Search A 0 ← → 0.000734 Ĥ 1878 2293 3021 Û 1791 2169 2765 0.001726 0.002491 0.005112 1798 2051 2316 2594 1653 1888 2127 2369 0.001446 0.001628 0.001893 0.002246 0.002000 672 of 695 0.000000 2723 2529 0.003882 U.VIVZ TABLE B.9 Specific Enthalpies of Selected Gases: U.S. Customary Units H OP TABLE B.8 Specific Enthalpies of Selected Gases: SI Units Ĥ (kJ/mol) Reference state: Gas, Pref= 1 atm, Tref = 25°C CO CO₂ H₂O Air 0₂ -0.72 -0.73 0.00 N₂ -0.73 H₂ -0.72 0.00 0 -0.73 -0.92 -0.84 25 0.00 0.00 0.00 0.00 0.00 100 2.19 2.24 2.19 2.16 2.19 2.90 2.54 200 5.15 5.31 5.13 5.06 5.16 7.08 6.01 300 8.17 8.47 8.12 7.96 8.17 11.58 9.57 13.23 17.01 400 11.24 11.72 11.15 10.89 11.25 16.35 500 14.37 15.03 14.24 13.83 14.38 21.34 600 17.55 18.41 17.39 16.81 17.57 26.53 20.91 700 20.80 21.86 20.59 19.81 20.82 31.88 24.92 800 24.10 25.35 23.86 22.85 24.13 37.36 29.05 900 27.46 28.89 27.19 25.93 27.49 42.94 33.32 1000 30.86 32.47 30.56 29.04 30.91 48.60 37.69 1100 34.31 36.07 33.99 32.19 34.37 54.33 42.18 1200 37.81 39.70 37.46 35.39 37.87 60.14 46.78 1300 41.34 43.38 40.97 38.62 41.40 65.98 51.47 1400 44.89 47.07 44.51 41.90 44.95 71.89 56.25 1500 48.45 50.77 48.06 45.22 48.51 77.84 61.09 V.VIIT 3248 3439 2946 3091 0.006112 0.007000 2857 2591 0.002668 V.VIZU 3105 2795 0.003106 CVIJO 3610 3224 0.007722 3324 2971 0.003536 VUITT 3771 3350 0.008418 3526 3131 0.003953 {" Ⓡ J 63 50 D ENG Sign in (0) + 0 7:53 AM 5/22/2023
||! PDF Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + 70°F Sunny File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf Draw T Read aloud Example 8.3-5 Solution Energy Balance on a Gas Preheater A stream containing 10% CH4 and 90% air by volume is to be heated from 20°C to 300°C. Calculate the required rate of heat input in kilowatts if the flow rate of the gas is 2.00 × 10³ liters (STP)/min. Q Search 441 of 695 Basis: Given Flow Rate Assume ideal-gas behavior. 2000 L (STP)/min, 20°C n(mol/min) 0.100 mol CH4/mol 0.900 mol air/mol CD n = 2000 L (STP) min HEATER (010) Q(kW) Recall that specifying the flow rate in liters (STP)/min does not imply that the feed gas is at standard temperature and pressure; it is simply an alternative way of giving the molar flow rate. 8.3 Changes in Temperature 421 1 mol 22.4L (STP) n(mol/min), 300°C 0.100 mol CH₂/mol 0.900 mol air/mol = 89.3 mol/min The energy balance with kinetic and potential energy changes and shaft work omitted is Q = AH. The task is to evaluate AH = [n¡Â¡- ΣnĤ₁. Since each species has only one inlet condition and one outlet out in condition in the process, two rows are sufficient for the enthalpy table. References: CH4(g, 20°C, 1 atm), air(g, 25°C, 1 atm) nin Ĥin nout Substance (mol/min) (kJ/mol) (mol/min) Ĥ out (kJ/mol) {" Ơ Ⓡ J 63 60 D ENG Sign in (0) + O 11:34 AM 5/22/2023
Transcribed Image Text:||! PDF Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + 70°F Sunny File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf Draw T Read aloud Example 8.3-5 Solution Energy Balance on a Gas Preheater A stream containing 10% CH4 and 90% air by volume is to be heated from 20°C to 300°C. Calculate the required rate of heat input in kilowatts if the flow rate of the gas is 2.00 × 10³ liters (STP)/min. Q Search 441 of 695 Basis: Given Flow Rate Assume ideal-gas behavior. 2000 L (STP)/min, 20°C n(mol/min) 0.100 mol CH4/mol 0.900 mol air/mol CD n = 2000 L (STP) min HEATER (010) Q(kW) Recall that specifying the flow rate in liters (STP)/min does not imply that the feed gas is at standard temperature and pressure; it is simply an alternative way of giving the molar flow rate. 8.3 Changes in Temperature 421 1 mol 22.4L (STP) n(mol/min), 300°C 0.100 mol CH₂/mol 0.900 mol air/mol = 89.3 mol/min The energy balance with kinetic and potential energy changes and shaft work omitted is Q = AH. The task is to evaluate AH = [n¡Â¡- ΣnĤ₁. Since each species has only one inlet condition and one outlet out in condition in the process, two rows are sufficient for the enthalpy table. References: CH4(g, 20°C, 1 atm), air(g, 25°C, 1 atm) nin Ĥin nout Substance (mol/min) (kJ/mol) (mol/min) Ĥ out (kJ/mol) {" Ơ Ⓡ J 63 60 D ENG Sign in (0) + O 11:34 AM 5/22/2023
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