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モル体積計算機

モル数から標準状態(STP、0°Cまたは25°C基準)における気体の体積を計算します。

はじめに

Molar Volume Calculator — Calculate the volume of an ideal gas from moles at 1 atm, at either 0 °C (22.414 L/mol) or 25 °C (24.465 L/mol). Enter Moles (mol), Conditions (ideal gas, 1 atm) to get an instant, accurate result.

計算式

Volume (L) = moles × molar volume, where molar volume = RT/P for an ideal gas at 1 atm: 22.414 L/mol at 0 °C (273.15 K) or 24.465 L/mol at 25 °C (298.15 K).

ステップごとの説明

  1. Enter the Moles (mol).
  2. Enter the Conditions (ideal gas, 1 atm).
  3. Click Calculate to see your result instantly.

実例

Example: With Moles (mol) = 1, Conditions (ideal gas, 1 atm) = 0c_1atm, the Molar Volume Calculator gives Volume L: 22.414, Liter Per Mole: 22.414, Conditions: 0 °C (273.15 K), 1 atm.

よくある質問

Why are there two different molar volume values, and which one is STP?
22.414 L/mol is for 0 °C (273.15 K) and 1 atm, the older "STP" convention; 24.465 L/mol is for 25 °C (298.15 K) and 1 atm, which is not STP. IUPAC's current STP is 273.15 K and 100 kPa, giving about 22.711 L/mol, so check which standard your textbook or course uses. All values follow from PV = nRT.
Does molar volume apply to real gases too?
It's exact only for an ideal gas; real gases deviate slightly, especially at high pressure or low temperature where intermolecular forces become significant.
What inputs does the Molar Volume Calculator need?
You'll need to provide: Moles (mol), Conditions (ideal gas, 1 atm). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Molar Volume Calculator?
The Molar Volume Calculator applies the formula exactly as calculated — Volume (L) = moles × molar volume, where molar volume = RT/P for an ideal gas at 1 atm: 22.414 L/mol at 0 °C (273.15 K) or 24.465 L/mol at 25 °C (298.15 K). — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Molar Volume Calculator free to use?
Yes, the Molar Volume Calculator is completely free, requires no signup, and runs instantly in your browser.

モル体積計算機について

The Molar Volume Calculator uses a real, verifiable formula — Volume (L) = moles × molar volume, where molar volume = RT/P for an ideal gas at 1 atm: 22.414 L/mol at 0 °C (273.15 K) or 24.465 L/mol at 25 °C (298.15 K). — so results are accurate every time, not an approximation.