# What was Amedeo Avogadro theory?

## What was Amedeo Avogadro theory?

Notes: Amedeo Avogadro’s (1776-1856) principal contribution to chemistry was a paper in which he advanced two hypotheses: (1) that equal volumes of gas contain equal numbers of molecules and (2) that elementary gases such as hydrogen, nitrogen, and oxygen were composed of two atoms.

**What was the big deal about Avogadro’s hypothesis?**

Avogadro’s hypothesis is crucially important in the history of chemistry: Avogadro’s hypothesis made it possible to determine relative molar masses. This made it possible to determine molecular formulas for gaseous substances and to create the atomic mass scale.

**What is Avogadro’s hypothesis in physics?**

Avogadro’s hypothesis states that equal volumes of all gases at equal temperature and pressure have the same number of molecules. According to Avogadro’s hypothesis number of molecules per unit volume is same for all gasesat a fixed P and T. Avogadro number is denoted by NA.

### Why was Avogadro’s hypothesis rejected for decades?

Avogadro made the distinction between atoms and molecules, which today seems clear. However, Dalton rejected Avogadro’s hypothesis because Dalton believed that atoms of the same kind could not combine. Therefore it seemed impossible for a molecule of oxygen, O2, to exist.

**When was the theory of Avogadro’s hypothesis published?**

Avogadro’s law (now known as Avogadro’s hypothesis) was first published in 1811 and is one of the main theories that helped to build the foundation for the ideal gas laws. These laws help to explain the relationship that gases have between the number of molecules and the volume of the container they fill.

**How is the ideal gas law related to Avogadro’s hypothesis?**

The combination of Boyle’s law, Charles’ Law, and Avogadro’s hypothesis gives the ideal gas law. where P is the pressure, V the volume, n the number of moles of gas, R the universal gas constant, and T is the temperature. For many reasons, Avogadro’s hypothesis was ignored for about 50 years.

#### How is Avogadro’s hypothesis related to molar volume?

Figure 10.13. 3: Avogadro’s hypothesis states that equal volumes of any gas at the same temperature and pressure contain the same number of particles. At standard temperature and pressure, 1 mole of any gas occupies 22.4 L. Equal volumes of gases under the same conditions contain the same number of particles.

**What did Amedeo Avogadro hypothesize about temperature and pressure?**

In 1811 Avogadro hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. From this hypothesis it followed that relative molecular weights of any two gases are the same as the ratio of the densities of the two gases under the same conditions of temperature and pressure.