consider the following reaction: 4Al + 3O2 is 2Al2O3 it takes 2L of pure oxygen gas at stp to react completely with a certain sample of aluminum. what is the mass of aluminum reacted

Iam in desperate need of with this !

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?

How do you lengthen a pattern piece? (family and consumer science, sewing)