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Avogadro Law Calculator

Work out avogadro law instantly with clear inputs, formula shown and shareable results.

About Avogadro Law Calculator

Avogadro's law states that at fixed temperature and pressure, volume is proportional to the number of moles: V1/n1 = V2/n2. Going from 0.2 to 0.35 mol expands 5 L to 8.75 L. The implied molar volume of 25 L/mol identifies the conditions, since molar volume is 22.7 L/mol at 0 C and 1 bar.

Formulas

Avogadro's law

V1 / n1 = V2 / n2 at constant T and P

Molar volume

Vm = V / n

Worked example

With the default values below, Avogadro Law Calculator returns Final Volume of 8.7500. Change any input above and every figure here is recalculated in your browser.

Inputs used

Initial volumeminimum 0 L
5 L
Initial amount of gasminimum 0 mol
0.2 mol
Final amount of gasminimum 0 mol
0.35 mol

Results

Final Volume
8.7500 L
Change In Volume
3.7500 L
Molar Volume At These Conditions
25.0000 L/mol
Ratio Of Amounts
1.7500

Step by step

  1. 1Values used
  2. 2Avogadro's law
  3. 3Molar volume
  4. 4Final Volume= 8.7500 L
  5. 5Change In Volume= 3.7500 L
  6. 6Molar Volume At These Conditions= 25.0000 L/mol
  7. 7Ratio Of Amounts= 1.7500

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Does the identity of the gas matter?

Not for an ideal gas - that is the point of the law. A mole of hydrogen and a mole of carbon dioxide occupy the same volume at the same conditions.

How does this connect to reaction stoichiometry?

For gaseous reactions, volume ratios equal mole ratios, so balanced coefficients can be read directly as volumes.

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