cal/(mol·K)
calorie per mole kelvin
Molar entropyexact by definition
The calorie per mole per kelvin, historically called the entropy unit, is exactly 4.184 J/(mol·K) using the thermochemical calorie. The factor is exact by definition of that calorie. Older American thermochemical tables list standard entropies in these units, where the gas constant R is 1.987 cal/(mol·K), often rounded to 2.
Watch out: The abbreviation e.u. for entropy unit appears in mid-twentieth-century literature and means exactly this unit. It is not the same as anything in modern SI naming, and it should be converted rather than carried forward.
| 1 cal/(mol·K) | 4.184 J/(mol·K) |
Solvers that use molar entropy