The Ideal Gas Law (PV = nRT) governs the relationship between pressure, volume, moles, and temperature of an ideal gas, and at Standard Temperature and Pressure (STP: 273 K, 1 atm) one mole of any ideal gas occupies a fixed molar volume of 22.4 L. This relationship allows the number of moles of a gas sample to be determined from its volume alone under STP conditions, via a direct proportion to the 22.4 L/mol constant. Molar mass, defined as mass per mole, can then be derived by dividing a sample's measured mass by its calculated number of moles, linking gas-phase measurements (volume, pressure, temperature) to composition identification in general chemistry.
The Ideal Gas Law (PV = nRT) governs the relationship between pressure, volume, moles, and temperature of an ideal gas, and at Standard Temperature and Pressure (STP: 273 K, 1 atm) one mole of any id…