How many gas particles occupy a volume of 22.4 L at standard temperature and pressure?
One mole of gas particles.
To determine the number of gas particles present in a volume of 22.4 L at standard temperature and pressure (STP), you can use the concept of molar volume.
At STP, one mole of any gas occupies a volume of exactly 22.4 liters. This is known as the molar volume of a gas at STP. Therefore, if the volume is given as 22.4 liters, it means there is one mole of gas particles present.
So, the answer to your question is one mole of gas particles.