Molar Enthalpy of Formation of Various Substances

Substance	Formula	M [kg/kmol]	hfo [kJ/kmol]
Carbon	C(s)	12.001	0
Hydrogen	H2(g)	2.016	0
Nitrogen	N2(g)	28.012	0
Oxygen	O2(g)	32	0
Carbon monoxide	CO(g)	28.013	-110,530
Carbon dioxide	CO2(g)	44.001	-393,520
Water Vapor	H2O(g)	18.016	-241,820
Water	H2O(l)	18.016	-285,820
Hydrogen peroxide	H2O2(g)	34.016	-136,310
Ammonia	NH3(g)	17.03	-46,190
Methane	CH4(g)	16.043	-74,850
Acetylene	C2H2(g)	26.038	226,730
Ethylene	C2H4(g)	24.034	52,280
Ethane	C2H6(g)	30.07	-84,680
Propylene	C3H6(g)	42.051	20,410
Propane	C3H8(g)	44.097	-103,850
n-Butane	C4H10(g)	58.123	-126,150
Benzene	C6H6(g)	78.114	82,930
n-Octane	C8H18(g)	114.231	-208,450
n-Octane	C8H18(l)	114.231	-249,950
n-Dodecane	C12H26(g)	170.22	-291,010
Methyl alcohol	CH3OH(g)	32.043	-200,670
Methyl alcohol	CH3OH(l)	32.043	-238,660
Ethyl alcohol	C2H5OH(g)	46.069	-235,310
Ethyl alcohol	C2H5OH(l)	46.069	-277,690
Oxygen	O(g)	16	249,190
Hydrogen	H(g)	1.008	218,000
Nitrogen	N(g)	14.006	472,650
Hydroxyl	OH(g)	17.008	39,460

Adapted from TEST (The Expert System for Thermodynamics) <www.thermofluids.net> by S.Bhattacharjee, San Diego State University

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Engineering Thermodynamics by Israel Urieli is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License