![]() Stanislao Cannizzarro explained this number four years after Avogadro's death while at the Karlsruhe Congress in The numeric value of the Avogadro constant expressed in reciprocal mole, a dimensionless number, is called the Avogadro numbersometimes denoted N or N 0 which is thus the number of particles that are contained in one mole, exactly 6. ![]() The Avogadro constant N A or L is the proportionality factor that relates the number of constituent particles usually moleculesatoms or ions in a sample with the amount of substance in that sample. Avogadros constant definition a level Avogadros constant definition a level
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