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Well Al2O3 has 2 atoms of aluminum (Al2) and 3 atoms of Oxygen (O3). Thus, as there are 2Al2O3 molecules there are 4 atoms of aluminum.
Molecules and elements are not the same thing. There are many molecules in elements but not elements inside of molecules.
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There are many different molecules. You should specify a specific molecule
How many elements are in 2mgso4
4Al + 3 O2 -------> 2Al2O3 so 4.20 x 3/4 = 3.15 moles of oxygen molecules
They are many as the oxides of many elements.
Diatomic molecules are molecules composed of two different elements. Examples include H2 , O2 , N2 , and many other elements in the same structure.
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They are both elements, form molecules, and will bond with many other elements.
Only Two
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