Yes, volume is always 22.4 L at STP.
STP is commonly used to define standard conditions for temperature and pressure which is important for the measurements and documentation of chemical and physical processes.
This empirical relationship can be derived from the kinetic theory of gases under the assumption of a perfect (ideal) gas.
The law applies approximately to real gases at sufficiently low pressures and high temperatures.
At STP, all gases have the same volume for 1 mole of gas, and this volume is always 22 L.
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