Chemistry · Ch 1 — Basic Concepts of Chemistry and Chemical Calculations
Molar Volume
1.4.3
Molar Volume
Molar volume is the volume occupied by one mole of any substance in the gaseous state, at a stated temperature and pressure. Because one mole of any gas contains the same number of molecules (Avogadro's hypothesis), one mole of any ideal gas occupies the same volume under the same conditions -- regardless of which gas it is. The commonly used reference values are:
| Conditions | Molar volume |
|---|---|
| 273 K and 1 bar pressure (STP) | 22.71 L |
| 273 K and 1 atm pressure | 22.4 L |
| 298 K and 1 atm pressure (Room Temperature and Pressure, SATP) | 24.47 L |
Table ~table-molar-volumeVolume occupied by one mole of a gaseous substance
| Conditions | Volume occupied by one mole of any gaseous substance (litre) |
|---|---|
| 273 K and 1 bar pressure (STP) | 22.71 |
| 273 K and 1 atm pressure | 22.4 |
Misc Evaluate Yourself 3Moles of ethane; molecules of oxygen gas
Worked out. An in-text practice box with two parts: (3a) calculate the number of moles present in 9 g of ethane; (3b) calculate the number of molecules of oxygen gas that occupies a volume of 224 ml at 273 K and 3 atm pressure. …