J/(mol·K)
joule per mole kelvin
Molar entropyexact by definition
The joule per mole per kelvin is the coherent SI unit of molar entropy and molar heat capacity, and its factor of 1 is exact. The gas constant R is 8.314 J/(mol·K) in these units, and standard molar entropies of common substances run from about 2.4 for diamond to 200 or more for gases. The kelvin here is a temperature interval, so it may be used with Celsius differences without conversion.
Watch out: Molar entropy and molar heat capacity share this unit but are different quantities. Standard entropies are absolute values referred to zero at absolute zero by the third law; heat capacities describe how energy content responds to temperature.
| 1 J/(mol·K) | 1 J/(mol·K) |
Solvers that use molar entropy