How do you calculate the ideal gas law constant?
You do an experiment in which you measure the values of
The Ideal Gas Law is
We can rearrange this to get
The units of
For example, repeated experiments show that at standard temperature and pressure (STP) — 273.15 K and 1 bar — 1 mol of gas occupies 22.711 L.
You can use this information to evaluate
If the pressure is measured in kilopascals (1 bar = 100 kPa), you calculate
If you use strictly SI units, then pressure is measured in pascals and volume is measured in cubic metres.
Always use the value of