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Amadeo Avogadro
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Scientist
    (August 9, 1776-July 9, 1856)
    Born in Turin, Italy
    Birth name was Lorenzo Romano Amadeo Carlo Avogadro
    Developed Avogadro’s Law (1811): equal volumes of gases at the same temperature and pressure will contain equal numbers of molecules
    Namesake for Avogadro’s constant: 6.022 x 10^23, the number of molecules of a compound (or atoms of an element) in a mole
    He was a lawyer before developing an interest in science.
    His ideas did not become widely accepted until after his death, partly because he tended to express his findings in ways that made more sense to physicists than chemists.
    The actual value of Avogadro’s number was calculated by Johann Josef Loschmidt (1865).
    He introduced the metric system to the Piedmont region of Italy.
    He determined the correct molecular formulas for many compounds, including water, ammonia, ethyl alcohol, carbon monoxide, carbon dioxide, nitric oxide and nitrous oxide.
    He was one of the first scientists to realize the importance of the distinction between molecules and atoms.
    Linus Pauling said that his work ‘forms the basis of the whole of theoretical chemistry’ and is ‘one of the greatest contributions to chemistry that has ever been made.’

Credit: C. Fishel


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