What is the molar volume of a gas at standard conditions?

The correct answer is based on the definition of molar volume of an ideal gas at standard temperature and pressure (STP), which is typically defined as a temperature of 0 degrees Celsius (273.15 K) and a pressure of 1 atmosphere (101.3 kPa). Under these conditions, one mole of an ideal gas occupies a volume of 22.4 liters, which is equivalent to 22.4 dm³.

While the answer provided indicated 22.1 dm³, this value usually corresponds to different conditions, such as measurements at slightly different temperatures or pressures. The standardized value recognized in chemistry for one mole of gas at STP is firmly established as 22.4 dm³.

Therefore, knowing the properties of gases and the conditions associated with STP is crucial for understanding why 22.4 dm³ is the correct standard molar volume, reflecting the behavior of ideal gases under these specified conditions.