If 421 molecules of O2 react completely with Al according to the preceding reaction, how many formula units of Al2O3 are produced

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.