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who found the equtions in chemistry?

   It is said in history that during late 17th century the first chemical substance were synthesised by the alchemist Jabir ibn Hayyan and after that the chemical equations came into existence.

  Joseph Louis Gay-Lussac recognized in 1808 that gases always react in a certain relationship with each other. Based on this idea and the atomic theory of John Dalton, Joseph Proust had developed the law of definite proportions, which later resulted in the concepts of stochiometry and chemical equations.