The former.
Yes. A molecule of Iron, only consists of one type of atom, namely, Iron
One molecule of iron oxide consists of one iron atom and one oxygen atom. Therefore, the total number of atoms in one molecule of iron oxide is two.
yes
Since iron oxide is made from TWO elements (Fe, and O), it is a compounds and so you have a MOLECULE, not an atom of iron oxide.
It is contained in each atom, which is Iron.
Endothermic.
One water molecule is formed from 2 hydrogen atoms and 1 oxygen atom. Rust is a chemical compound of iron and oxygen. When the nail is put in the water, a chemical reaction begins. If you have 1 iron atom and 1 water molecule, then the water molecule comes apart into one molecule of hydrogen, witch forms the bubbles and one ion(a highly reactive atom) of oxygen. Then the oxygen ion reacts with the iron atom and forms a rust molecule.
Ferric oxide is a compound made up of iron and oxygen atoms. It is not an atom or a molecule on its own, but rather a combination of atoms.
oxygen
a. 1 iron atom per molecule. in total, two atoms
If iron(II), then iron sulfate is FeSO4. This has a single Fe atom per molecule (or two Fe in two molecules). If you have iron(III), then iron sulfate is Fe2(SO4)3. This compound has two iron atoms per molecule (or four Fe in two molecules).
Iron's atomic symbol is Fe. Iodine's atomic symbol is I. There is no iron in that molecule. ICl5 is a molecule not an atom. As for the hybridization i would suggest you drop your chem class if you don't know basic fundamentals of atomic symbols and the difference between molecules and atoms