Chemist

Amedeo Avogadro • • • •

Born: 9 August 1776 Birthplace: Turin, Piedmont, Italy Died: 9 July 1856 Best Known As: The guy they named Avogadro's Number after

Name at birth: Lorenzo Romano Amedeo Carlo Avogadro Italian physicist Amedeo Avogadro put forth the hypothesis that equal volumes of gases under the same conditions of pressure and temperature contain the same number of particles. Trained as a lawyer, Avogadro turned to the study of science and spent most of his career as Chair of Mathematical Physics at Turin. Although he published widely on subjects in physics and chemistry, he is most famous for building on the work of French chemist Joseph Louis Guy-Lussac (17781850) with the 1811 publication of his hypothesis, and the idea that gases are made up of atoms or combinations of atoms (molecules) and can be quantified. Although his work was largely ignored during his lifetime, by the 1880s it was universally accepted, thanks to Stanislao Cannizzaro, who created a table of atomic weights based on Avogadro's work. Later physicists and chemists determined the value of "Avogadro's Number," the number of gas molecules in one mole (the atomic or molecular weight in grams), as 6.022 x 1023. In 1787 Avogadro inherited his father's title as Count of Quaregna.

His Contribution in chemistry [b. Turin, Piedmont (Italy), August 9, 1776, d. Turin, July 9, 1856] In 1811 Avogadro proposed that equal volumes of gas at the same temperature and pressure contain the same number of molecules. Avogadro himself coined the word "molecule" to mean the smallest part of a compound. On the basis of his law Avogadro became the first to show that water is H2O -- that is, composed of molecules of two atoms of hydrogen and one of oxygen. The related concept, called Avogadro's number, is that

when the mass of a compound in grams is equal to the molecular weight, the total number of molecules is always the same, equal to 1 mole

Submitted to: Mr. Lemuel M. Sayao Chemistry Teacher

Submitted by: Ray Emerson Ayag III-Obedience