Standardized Enthalpies and Entropies

Standardized enthalpies and entropies of some common substances

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Standardized enthalpies and entropies of some common substances:

Substance	Entropy - s -		Enthalpy - h -
Substance	Btu/lbmole R	J/gmole K	Btu/lbmole	J/gmole
Acetylene C₂H₂	47.97	200.82	97,495	226,757
Benzene C₆H₆	64.3	269.21	35,653	82,923
n-Butane C₄H₁₀	74.1	310.03	-53,627	-124,727
Carbon Dioxide CO₂	51.03	213.66	-169,183	-393,492
Carbon Monoxide CO	47.3	197.92	-47,517	-110,516
Ethane C₂H₆	54.8	229.48	-36,401	-84,662
Hydrogen H₂	31.2	130.60	0	0
Methane CH₄	44.5	186.19	-32,179	-74,843
Nitrogen N₂	45.8	191.56	0	0
Oxygen O₂	48.99	205.09	0	0
Propane C₃H₈	64.47	269.92	-44,647	-103,848
Water H₂O	16.72	70.00	-122,976	-286,022

equilibrium states at 25^oC (77^oF) and 1 atm

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Related Topics

Thermodynamics The effects of work, heat and energy on a system

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1st Law of Thermodynamics The First Law of Thermodynamics simply states that energy can be neither created nor destroyed (conservation of energy). Thus power generation processes and energy sources actually involve conversion of energy from one form to another, rather than creation of energy from nothing
2nd Law of Thermodynamics The second law is concerned with entropy, which is a measure of disorder. The second law says that the entropy of the universe increases
Heat, Work and Energy Tutorial to heat, work and energy - essentials as specific heat and specific heat capacity

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