Standard molar volume

Determine the value of the gas constant R in units of ft3 atm/lb mol °R), starting with the value of the standard molar volume of a perfect gas. 

Plan Standard molar volume, referring to the volume that one mole of gas occupies at STP, can be... 

Standard molar volume Standard molar volume... 

If, however, site interactions of atoms on energetically equivalent sites are equal and the standard molar volumes of mixing components are not dissimilar (i.e., within 5 to 10% difference), equation 3.157 may be simplified and the activity of any component i in the mixture (a,) may be expressed in a generalized fashion as shown by Helgeson et al. (1978) ... 

The four gas laws in the previous section are all special cases of the ideal gas law. We can use the ideal gas law to calculate the volume one mole of gas occupies at standard conditions. Standard conditions are 0°C (273 K) and 1 atm pressure. The volume at these conditions is known as a standard molar volume. Plugging the numbers into the ideal gas law equation gives a value of 22.4 liters for the standard molar volume. 

Put another way, Avogadro s law also says that equal volumes of different gases at the same temperature and pressure contain the same molar amounts. A 1 L container of oxygen contains the same number of moles as a 1 L container of helium, fluorine, argon, or any other gas at the same T and P. Experiments show that 1 mol of an ideal gas occupies a volume (the standard molar volume) of 22.414 L at 0°C and 1.0000 atm pressure. For comparison, the standard molar volume is almost exactly the same as the volume of three basketballs. 

The specific conditions used in the calculation—1 atm pressure and 0°C (273.15 K)—are said to represent standard temperature and pressure, abbreviated STP. These standard conditions are generally used when reporting measurements on gases. Note that the standard temperature for gas measurements (0°C, or 273.15 K) is different from that usually assumed for thermodynamic measurements (25°C, or 298.15 K Section 8.6). Note also that the standard pressure for gas measurements, still listed here and in most other books as 1 atm (101,325 Pa), has been redefined to be 1 bar (100,000 Pa). Thus, the new standard pressure is 0.986 923 atm, making the standard molar volume 22.711 L rather than 22.414 L. 

The surface temperature of Venus is about 1050 K, and the pressure is about 75 Earth atmospheres. Assuming that these conditions represent a Venusian "STP," what is the standard molar volume (in liters) of a gas on Venus ... 

Use molar mass or - -standard molar volume as a conversion factor. 

The Standard Molar Volume of a gas is the volume that exactly 1 mole of an ideal gas occupies under STP conditions. The standard molar volume of a gas is 22.71 L. 

The value of R in SI units is 8.314 J/mol/K. We can calculate this from the standard molar volume in cubic meters and the standard pressure in pascals. 

For the formulation of a dimensionless adsorption equilibrium constant the definition of a standard state is crucial. The standard state is freely selectable, regardless of the possibility of its physical realization. It is defined according to its expediency. The standard state of adsorption is assumed to be the ratio of a standard molar volume to the standard molar surface [4],... 

Standard molar volume and density (at room temperature)... 

Since the value of the molar Van der Waals volume of a polymer is derived from universal values of atomic radii and atomic distances, it may be concluded that the method of calculation of the different standard molar volumes (1298 K) as given by Eq. (4.8) provides a sound basis for the estimation of polymer densities under standard conditions. 

Recommended values for group contributions to standard molar volume, 87 Recoverable shear, 531,551 Recoverable shear strain, 551 Recrystallisation, 703 Rectilinear flow, 527 Redox doping, 341 Reduced... 

Stability of fluid threads in melt spinning, 810 Standard molar volumes at room temperature, 76 Stanton number, 59 Static charging, 882 Static electrification, 333 Staudinger index, 250 Steady state, 697 Stefan number, 56... 

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