This episode explains how to use gas stoichiometry at Standard Temperature and Pressure (STP). It defines STP as 0°C and 1 atm, where one mole of any ideal gas occupies 22.4 liters. The episode demonstrates how this value serves as a key conversion factor for solving stoichiometry problems, allowing you to convert between gas volumes and moles. It works through examples, including a limiting reactant problem, and emphasizes that this shortcut only applies at STP.