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Enthalpy of formation, Gibbs function of formation, and absolute entropy at 25ยฐC, 1 atm he a ยป 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) โ241,820 -โ228,590 188.83 Water H,0(ยข) โ285,830 -237,180 69.92 Hydrogen peroxide H,0,(g) -136,310 -105,600 232.63 Ammonia NH;(g) โ46,190 โ16,590 192.33 Methane CH, (2) โ74,850 โ50,790 186.16 Acetylene C2H3(g) +226,730 +209,170 200.85 Ethylene C2H,(g) +52,280 +68,120 219.83 Ethane CzH,te) โ84,680 โ32,890 229.49 Propylene C3H,te) +20,410 +62,720 266.94 Propane C3Halg) โ 103,850 โ23,490 269.91 n-Butane C,H o(e) 126,150 -15,710 310.12 n-Octane CeHy ale) โ208,450 +16,530 466.73 n-Octane CaHya(โฌ) โ249,950 +6,610 360.79 n-Dodecane Cy oHoelg) โ291,010 +50,150 622.83 Benzene C.He(g) +82,930 +129,660 269.20 Methyl alcohol CH20H(g) โ200,670 -162,000 239.70 Methyl alcohol CH,OH(ยข) โ238,660 -โ166,360 126.80 Ethyl! alcohol C,H,OH(g) -โ235,310 -โ168,570 282.59 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). 
