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The SI unit of molar heat capacity is joule per kelvin per mole, J⋅K −1 ⋅mol −1. Like the specific heat, the measured molar heat capacity of a substance, especially a gas, may be significantly higher when the sample is allowed to expand as it is heated ( at constant pressure , or isobaric ) than when it is heated in a closed vessel that ...
For gases, departure from 3 R per mole of atoms is generally due to two factors: (1) failure of the higher quantum-energy-spaced vibration modes in gas molecules to be excited at room temperature, and (2) loss of potential energy degree of freedom for small gas molecules, simply because most of their atoms are not bonded maximally in space to ...
It is defined as one kilocalorie of energy (1000 thermochemical gram calories) per one mole of substance. The unit symbol is written kcal/mol or kcal⋅mol −1. As typically measured, one kcal/mol represents a temperature increase of one degree Celsius in one liter of water (with a mass of 1 kg) resulting from the reaction of one mole of reagents.
The standard enthalpy of formation is measured in units of energy per amount of substance, usually stated in kilojoule per mole (kJ mol −1), but also in kilocalorie per mole, joule per mole or kilocalorie per gram (any combination of these units conforming to the energy per mass or amount guideline).
7 N nitrogen (N 2) use (N 2) 0.720 CRC (N 2) 0.71 LNG (N 2) 0.720 WEL (per mol N atoms) 0.36 8 O oxygen (O 2) use (O 2) 0.444 CRC (O 2) 0.44 LNG (O 2) 0.444 WEL (per mol O atoms) 0.222 9 F fluorine (F 2) use (F 2) 0.510 CRC (F 2) 0.51 LNG (F 2) 0.510 WEL (per mol F atoms) 0.26 10 Ne neon; use: 0.335 CRC: 0.328 LNG: 0.335 WEL: 0.34 11 Na sodium ...
Lange indirectly defines the values to be standard atmosphere of "1 atm (101325 Pa)", although citing the same NBS and JANAF sources among others. It is assumed this inexactly refers to "ambient pressure".
For example, terrestrial air is primarily made up of diatomic gases (around 78% nitrogen, N 2, and 21% oxygen, O 2), and at standard conditions it can be considered to be an ideal gas. The above value of 1.4 is highly consistent with the measured adiabatic indices for dry air within a temperature range of 0–200 °C, exhibiting a deviation of ...
[1] For a fuel of composition C c H h O o N n, the (higher) heat of combustion is 419 kJ/mol × (c + 0.3 h − 0.5 o) usually to a good approximation (±3%), [2] [3] though it gives poor results for some compounds such as (gaseous) formaldehyde and carbon monoxide, and can be significantly off if o + n > c, such as for glycerine dinitrate, C 3 ...