Table of Standard Molar Entropies

Submitted by ChemPRIME Staff on Thu, 12/09/2010 - 14:15

Compound Smo /J K-1mol-1 Compound Smo /J K-1mol-1
Solids Diatomic Gases
C (diamond) 2.377
C (graphite) 5.74 H2 130.7
Si 18.8 D2 145.0
Ge 31.1 HCl 186.9
Sn (gray) 44.1 HBr 198.7
Pb 64.8 HI 206.6
Li 29.1 N2 191.6
Na 51.2 O2 205.1
K 64.2 F2 202.8
Rb 69.5 Cl2 223.1
Cs 85.2 Br2 245.5
NaF 51.5 I2 260.7
MgO 26.9 CO 197.7
AlN 20.2 Triatomic Gases
NaCl 72.1 H2O 188.8
KCl 82.6 NO2 240.1
Mg 32.7 H2S 205.8
Ag 42.6 CO2 213.7
I2 116.1 SO2 248.2
MgH2 31.1 N2O 219.9
AgN3 99.2 O3 238.9
Liquids Polyatomic Gases( > 3)
Hg 76.0 CH4 186.3
Br2 152.2 C2H6 229.6
H2O 69.9 C3H8 269.9
H2O2 109.6 C4H10 310.2
CH3OH 126.8 C5H12 348.9
C2H5OH 160.7 C2H4 219.6
C6H6 172.8 N2O4 304.3
BCl3 206.3 B2H6 232.0
Monatomic Gases BF3 254.0
He 126.0 NH3 192.5
Ne 146.2
Ar 154.8
Kr 164.0
Xe 169.6

This table shows molar entropies for the standard conditions of 298.15 K (25°C) and 101.3 kPa. Such conditions need to be specificed, since entropyA thermodynamic state function, symbol S, that equals the reversible heat energy transfer divided by temperature; higher entropy corresponds to greater dispersal of energy on the molecular scale. See also standard entropy. is propotional to substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula. amount, and dependent on temperatureA physical property that indicates whether one object can transfer thermal energy to another object., pressureForce per unit area; in gases arising from the force exerted by collisions of gas molecules with the wall of the container.. Entropy is also dependent upon volume, but since the amount, n, temperature, and pressure are given, volume is implicitly defined. This table is taken from CoreChem:Standard Molar Entropies, and is also used on CoreChem:Dependence of S on Molecular Structure as well as CoreChem:Some Trends In Entropy Values.