El almíbar, que es una solución acuosa de sacarosa (C12H22O11) y que se usa para conservar las frutas, se prepara a una concentración entre el 25% y 30% en masa y tiene una densidad de 1.250 g/ml. Si se necesita preparar 475 ml de un almíbar al 28% en masa. ¿Cuántos gramos de sacarosa se deben pesar para preparar la solución? *

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Which sample at stp has the same number of atoms as 18 liters of ne at stp