Scientific Laws & Principles

Basic

Avogadro's Law

At the same temperature and pressure, equal volumes of gases contain equal numbers of molecules — so volume is proportional to moles.

Formula

\frac{V_1}{n_1} = \frac{V_2}{n_2}

Variables

VVolume of gas

nNumber of moles

Example

Doubling the moles of gas at constant T and P doubles the volume.

Did You Know?

One mole of any ideal gas occupies 22.4 litres at standard temperature and pressure.

gas volume moles avogadro law

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More in Scientific Laws & Principles

Law of Conservation of Mass

In a closed system, matter is neither created nor destroyed — the total mass before a reaction equals the total mass after.

Law of Definite Proportions

A given chemical compound always contains its component elements in the same fixed ratio by mass, regardless of source.

Law of Multiple Proportions

When two elements form more than one compound, the masses of one element combining with a fixed mass of the other are in ratios of small whole numbers.

Dalton's Law of Partial Pressures

The total pressure of a mixture of non-reacting gases equals the sum of the partial pressures each gas would exert alone.

Graham's Law of Effusion

The rate at which a gas effuses through a tiny hole is inversely proportional to the square root of its molar mass.

Raoult's Law

The vapour pressure of a solvent above a solution equals its mole fraction times the pure solvent's vapour pressure.