Molar Volume Calculator

Molar volume is the volume occupied by one mole of a substance. For ideal gases, it can be calculated using the formula V = RT/P, where R is the gas constant, T is temperature, and P is pressure.

At STP (Standard Temperature and Pressure: 273.15 K and 1 atm), the molar volume of an ideal gas is approximately 22.414 L/mol. This value is constant for all ideal gases under these conditions.

An ideal gas is a theoretical gas composed of point-like particles with no intermolecular interactions. Real gases like hydrogen, oxygen, nitrogen, and noble gases behave approximately like ideal gases at normal temperatures and pressures.

The ideal gas law is most accurate at high temperatures and low pressures. For most common gases under normal conditions, the error is minimal and acceptable for practical calculations.

At STP, 2.0 moles of nitrogen will occupy 2.0 × 22.414 = 44.828 L. This calculation applies to any ideal gas at standard conditions.

Real gases behave most like ideal gases at higher temperatures and lower pressures, where intermolecular forces are minimized and molecular volume becomes negligible compared to container volume.

The gas constant R depends on your units: 0.082057 L·atm·mol⁻¹·K⁻¹ for pressure in atm, or 8.314 J·mol⁻¹·K⁻¹ for pressure in Pa. The calculator automatically uses the appropriate value.

Yes, you can calculate molar volume at any temperature and pressure using the custom conditions mode. Simply enter your desired temperature and pressure values with appropriate units.