Here are the most recommended, widely-used, and academically rigorous textbooks available in digital format. These are the gold standards for self-study and university courses.
Existen plataformas educativas y universidades que ofrecen material gratuito y de libre acceso para apoyar el aprendizaje: quimica general libros pdf
While technically English, OpenStax (Rice University) offers a completely free and legal PDF. You can find unofficial Spanish translations or use browser translation. Here are the most recommended, widely-used, and academically