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Molar mass, gas constant, and critical-point properties Gas Critical-point properties Molar mass, constant, Temperature, Pressure, Volume, Substance Formula Mkg/kmol RkJ/kg·K* K MPa m3/kmol Air — 28.97 0.2870 132.5 3.77 0.0883 Ammonia NH 3 17.03 0.4882 405.5 11.28 0.0724 Argon Ar 39.948 0.2081 151 4.86 0.0749 Benzene C 6H 6 78.115 0.1064 562 ...
4 Νοε 2012 · The Universal Gas Constant - R u - appears in the ideal gas law and can be expressed as the product between the Individual Gas Constant - R - for the particular gas - and the Molecular Weight - M gas - for the gas, and is the same for all ideal or perfect gases :
The gas constant occurs in the ideal gas law: where P is the absolute pressure, V is the volume of gas, n is the amount of substance, m is the mass, and T is the thermodynamic temperature. Rspecific is the mass-specific gas constant. The gas constant is expressed in the same unit as molar heat.
Table A-2 Molar mass, gas constant, specific heats and critical-point properties Critical Properties Molar mass, M k Gas constant, RCp CvTemperature, Pressure, Volume, Substance Formula kg/kmol kJ/kg K kJ/kg K kJ/kg K K kPa m3/kmol Air 28.967 1.400 0.287032 1.0047 0.7177 132.5 3,786 0.08446 Ammonia NH 3 17.031 1.304 0.488196 2.0948 1.6066 405.4 11,333 0.07569 ...
For wet-gas and gas-condensate mixtures, wellstream gravity, w, must be used instead of g 3in Eq. 3.35. Gas density may range from 0.05 lbm/ft3 at standard conditions to 30 lbm/ft3 for high-pressure gases. Gas molar volume, v g, is given by v g ZRTp, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (3.36) where typical values of v
11 Φεβ 2021 · Get the definition and value of the ideal gas constant (R), which is also called the universal gas constant or molar gas constant.
*The gas constant is calculated from R 5 R u/M, where R u 5 1.9859 Btu/lbmol·R 5 10.732 psia·ft3/lbmol·R is the universal gas constant and M is the molar mass. Source: Specific heat values are mostly obtained from the property routines prepared by The National Institute of Standards and Technology (NIST), Gaithersburg, MD.
