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Proust's Law: The elemental composition of a substance, in mass, regardless of the method of obtaining it, is always constant. Check out our video lesson to understand what this means in practice! Want to know more about the subject? Brasil Escola Proust's Law or Law of Constant Proportions - http://brasilescola.com/quimica/lei-p... Calculations involving Proust's Law - http://brasilescola.com/quimica/calcu... Ponderal laws - http://brasilescola.com.br/quimica/le... Chemistry - http://brasilescola.com/quimica Mundo Educação Ponderal laws - http://mundoeducacao.com/quimica/leis... Proust's Law - http://mundoeducacao.com/quimica/lei-... Calculations with Proust's Law - http://mundoeducacao.com/quimica/calc... Chemistry - http://mundoeducacao.com/quimica Alunos Online Ponderal Laws - http://alunosonline.com.br/quimica/le... Chemistry - http://alunosonline.com.br/quimica Chemistry Manual Proust's Law of Constant Proportions - http://www.manualdaquimica.com/quimic... Follow us: Brasil Escola: http://www.brasilescola.com/ Facebook: / brasilescola Instagram: / brasilescolaoficial #Enem #BrasilEscola #Chemistry