Lei Avogadro V/n
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Avogadro's Law (V/n) calculator helps determine the relationship between gas volume and substance amount (moles) at constant temperature and pressure. This law states that, under identical conditions, gas volume is directly proportional to the number of moles. The formula used is V₁/n₁ = V₂/n₂, where V is volume and n is moles. It's useful for chemical reactions involving gases, such as determining how volume changes when moles are added or removed.
To use the calculator, input known values of volume and moles for one scenario (V₁, n₁) and provide either the volume or moles (V₂ or n₂) for the other scenario. Calculations are done automatically based on the proportion set by the formula. For example: if 2 moles of gas occupy 4 liters, how many liters will 3 moles occupy under the same conditions? The answer is 6 liters, maintaining the V/n proportion.
This calculator is suitable for simplified ideal gas calculations, such as in school labs or industries. Remember that Avogadro's Law assumes temperature and pressure remain constant. If not, laws like Charles's or Boyle's should adjust parameters before applying this formula. Results predict changes in closed systems like balloons or chemical reactors.
Common precautions include: 1) Ensuring temperature and pressure stay constant; 2) Validating if the gas behaves ideally (real gases may deviate); 3) Avoiding confusion with other gas laws. Accuracy depends on input precision. For real gases under extreme conditions, consult thermodynamic adjustments.
Frequently asked questions
What is Avogadro's Law?
It states that, at constant temperature and pressure, the volume of a gas is directly proportional to the number of moles present. This means doubling the moles will double the occupied volume.
When should I use this calculator?
Use it when calculating volume or mole changes for a gas under constant temperature and pressure, such as in chemical reactions or balloon expansions.
Does this law apply to all gases?
Avogadro's Law applies to ideal gases. Real gases may deviate, especially under high pressure or low temperature conditions.
What if temperature is not constant?
If temperature varies, Avogadro's Law doesn't apply directly. Use Charles's Law or the ideal gas equation in these cases.
How does pressure affect the calculations?
Pressure must remain constant for Avogadro's Law to apply. If pressure changes, combine Boyle's Law with this formula for accurate results.