Today, molecular viewers are an undeniable reality in the classroom. This type of softwares allow students the three dimensional development. In this study, free access molecular viewer Avogadro was used. The using of the program was successful not only in the three dimensional training, but in the pointing out of carbons’ quilarity of optical isomers. In fact, the velocity was reduced to a half part in comparison to bidimensional molecules. On the other hand, students were prone to the usage of Avogadro in basic and advanced chemical courses.