¿Cual es la concentración de una disolución de bromuro de potasio en agua, obtenida al disolver 3,1g de dicha sal en agua hasta conseguir un volumen final de disolución de 250 ml?

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".