What is the volume of one mole of gas at room temperature and pressure (RTP)?

At room temperature and pressure (RTP), which is typically defined as a temperature of 20-25°C and a pressure of 1 atmosphere, one mole of an ideal gas occupies a volume of approximately 24 dm³ (or liters). This value is derived from the ideal gas law (PV = nRT), where the conditions specified for RTP allow for a consistent approximation of the volume of gases at these conditions.

Consequently, the volume of 24 dm³ serves as a widely accepted standard in chemistry for practical calculations involving gases, especially in the context of stoichiometric calculations in reactions involving gases. This standardization is particularly useful for laboratory settings and when measuring the amounts of gaseous reactants or products in chemical reactions.