Heats of formation of compounds at 298K from elements in their standard states
Compound DHo298
(kcal mol-1)
H+(aq), proton 0.0
Na+(aq), sodium ion -57.28
NaF(s), sodium fluoride -136.0
NaCl(s), sodium chloride -98.23
NaBr(s), sodium bromide -86.03
NaI(s), sodium iodide -68.84
C(s), diamond 0.453
CO2(g), carbon dioxide -94.05
CH4(g), methane -17.89
C2H6(g), ethane -20.24
C3H8(g), propane -24.82
n-C4H10(g), n-butane -29.81
C6H6(g), benzene 19.82
CH3OH(g), methanol -48.10
C2H5OH(g), ethanol -56.27
C2H5OH(l), ethanol -66.35
NH3(g), ammonia -11.04
NH3(aq), ammonia -19.32
NH4+(aq), ammonium ion -31.74
NH4Cl(s), ammonium chloride -75.38
OH-(aq), hydroxide ion -54.96
H2O(g), water -57.80
H2O(l), water -68.32
F-(aq), fluoride ion -78.66
HF(g), hydrogen fluoride -64.20
Cl-(aq), chloride ion -40.02
HCl(g), hydrogen chloride -22.06
HCl(aq), hydrogen chloride -40.02
Br-(aq), bromide ion -28.90
I-(aq), iodide ion -13.37