Cuantos ml de HClO4 se requieren para preparan 2L de una solucion 0.25M de HClO4 a partir de reactivo concentrado que tiene una densidad de 1.07g/ml y una pureza en peso del 71%?

Kelly has come up with an explanation for why her sister is sometimes in a good mood and other times in a bad mood. she speculates that it is based on the hours of sleep her sister got the previous night. this explanation for her sister's behaviors is an example of a(n)