question archive The is PV = nRT, where R is the Universal Gas Constant or Ideal Gas Constant
The is PV = nRT, where R is the Universal Gas Constant or Ideal Gas Constant
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The is PV = nRT, where R is the Universal Gas Constant or Ideal Gas Constant.
We can rearrange this to get R = PV/nT
To calculate R, you must do an experiment in which you measure the values of P, V, n, and T. You then insert these values into the equation. The units of R depend on the units you use for P and V.
For example, repeated experiments show that at standard temperature (273.15 K) and pressure (1 atm), 1 mol of gas occupies 22.414 L. You can use this information to evaluate R. R = PV/nT = 1 atm ×22.414 L/(1 mol × 273.15 K) = 0.082 057 L•atm•K?¹mol?¹
If the pressure is measured in kilopascals (1 atm = 101.325 kPa), you calculate R = PV/nT = 101.325 kPa × 22.414 L/(1 mol × 273.15 K) = 8.3145 kPa•L•K?¹mol?¹
If you use strictly SI units, then pressure is measured in pascals and volume is measured in cubic metres. R = PV/nT = 1.013 25 × 10? Pa × 22.414× 10?³ m³//(1 mol × 273.15 K) = 8.3145 Pa•m³K?¹mol?¹
The most common values of R are R = 0.082 057 L•atm•K?¹mol?¹ R = 8.3145 kPa•L•K?¹mol?¹ R = 8.3145 Pa•m³K?¹mol?¹ R = 8.3145 J•K?¹mol?¹
Always make sure that you use the value of R that corresponds to the units that you are using for P and V
