Molar difference enthalpy for selected compounds

Most data are taken from the NIST database, those marked by * are (re-)fitted by JK.

formulacompoundrange/KΔfH°mfH°m298.15 K/(kJ mol-1) as a function of t=T/(1000 K)ΔfH°m298.15 K
/(kJ mol-1)
D
C2H4ethylene298–1200 -4.29362-6.38788*t+92.20095*t**2-37.657267*t**3+7.1239825*t**4-0.31554/t  52.46694  
C2H5OHethanol(g)273–1300 -7.25-6.372731*t+136.5066*t**2-54.3367*t**3+9.6942975*t**4-0.334329/t  -235.3 *
C4H10butane250–1500 -9.555-20.07935*t+223.2074*t**2-85.869833*t**3+14.57508*t**4-0.63782/t  -126.3  
C6H6benzene(g)273–3000 -44.7616+71.0536*t+104.8432*t**2-26.102617*t**3+2.556445*t**4+4.451/t  82.93 *
CH4methane298–1300 -1.97066-0.703029*t+54.23865*t**2-14.173857*t**3+1.465697*t**4-0.678565/t  -74.8731  
CO2carbon dioxide270–5000 -6.4042-11.401074*t-27.615766*t**2+1.7163693*t**3-0.072895*t**4-0.110128/t+77.289951*t*sqrt(t)  -393.5224 *
COcarbon monoxide298–6000 -8674.7138+29061.55000*t+103.869500*t^2+25474.58869/(exp(3.09921/t)-1)  -110.53 *
H2Owater(g)500–1700 -9.0546+30.092*t+3.416255*t**2+2.2644783*t**3-0.63362*t**4-0.082139/t  -241.8264  
N2nitrogen298–6000 -7.98923+26.092*t+4.1094005*t**2-0.65871367*t**3+0.0398185*t**4-0.044434/t  0  
O2oxygen298–6000 -9.861391+29.659*t+3.0686305*t**2-0.395507*t**3+0.023945*t**4+0.219663/t  0  
O2oxygen200–5000 -6.0514+8.99044*t-10.777715*t**2+0.818839*t**3-0.0403775*t**4-0.175056/t+29.891342*t*sqrt(t)  0 *

Warning: There may be some inconsistency between the formula and the 298.15 K value

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