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%?

Examine the false statement. compounds are the smallest unit of an element that occur most commonly in nature. select the rewording of the statement that is true. a: atoms are the smallest unit of an element that commonly occur in nature. b: molecules are the smallest unit of an element or compound that commonly occur in nature. c: molecules are the smallest unit of a compound that occur on the periodic table. d: compounds are the smallest unit of an element that occur on the periodic table