Molar Volume Calculator Formula

Understand the math behind the molar volume calculator. Each variable explained with a worked example.

Use the Molar Volume Calculator

Formulas Used

Molar Volume

molar_volume = (0.08206 * temp) / pressure

Variables

VariableDescriptionDefault
tempTemperature (T)(K)273.15
pressurePressure (P)(atm)1

How It Works

Molar Volume of a Gas

Formula

V_m = RT / P

Where:

  • V_m = molar volume (L/mol)
  • R = 0.08206 L·atm/(mol·K)
  • T = temperature (K)
  • P = pressure (atm)

    • At STP (273.15 K, 1 atm), V_m = 22.414 L/mol for any ideal gas.

    Worked Example

    Calculate molar volume at STP (273.15 K, 1 atm).

    temp = 273.15pressure = 1
    1. 01V_m = RT / P
    2. 02V_m = (0.08206 × 273.15) / 1
    3. 03V_m = 22.414 L/mol

    Ready to run the numbers?

    Open Molar Volume Calculator