Partial preview of the text
Download Combustion internal table and more Papers Thermal Engineering in PDF only on Docsity!
Enthalpy of formation, Gibbs function of formation, and absolute entropy at 25°C, 1 atm he a » Substance Formula kJ/kmol kJ/kmol kJ/kmol - K Carbon Cis) 0 0 5.74 Hydrogen H,(g) 0 0 130.68 Nitrogen N,(g) 0 0 191.61 Oxygen O2(g) 0 0 205.04 Carbon monoxide CO(g) -110,530 -137,150 197.65 Carbon dioxide cO,(g) -393,520 -394,360 213.80 Water vapor H,0(g) —241,820 -—228,590 188.83 Water H,0(¢) —285,830 -237,180 69.92 Hydrogen peroxide H,0,(g) -136,310 -105,600 232.63 Ammonia NH;(g) —46,190 —16,590 192.33 Methane CH, (2) —74,850 —50,790 186.16 Acetylene C2H3(g) +226,730 +209,170 200.85 Ethylene C2H,(g) +52,280 +68,120 219.83 Ethane CzH,te) —84,680 —32,890 229.49 Propylene C3H,te) +20,410 +62,720 266.94 Propane C3Halg) — 103,850 —23,490 269.91 n-Butane C,H o(e) 126,150 -15,710 310.12 n-Octane CeHy ale) —208,450 +16,530 466.73 n-Octane CaHya(€) —249,950 +6,610 360.79 n-Dodecane Cy oHoelg) —291,010 +50,150 622.83 Benzene C.He(g) +82,930 +129,660 269.20 Methyl alcohol CH20H(g) —200,670 -162,000 239.70 Methyl alcohol CH,OH(¢) —238,660 -—166,360 126.80 Ethyl! alcohol C,H,OH(g) -—235,310 -—168,570 282.59 Ethyl alcohol CoHeOH(f) -277,690 -174,890 160.70 Oxygen O(g) +249,190 +231,770 161.06 Hydrogen H(g) +218,000 +203,290 114.72 Nitrogen Nig) +472,650 +455,510 153.30 Hydroxyl OH(g) +39,460 +34,280 183.70 Source: From JANAF, Thermochemical Tables (Midland, Ml: Dow Chemical Co., 1971); Selected Values of Chemical Thermodynamic Properties, NBS Technical Nate 270-3, 1968; and API Research Project 44 (Carnegie Press, 1953). 
