A molecular formula lists the numbers of the atoms of a specific element in a compound. A structural formula is a picture of how the atoms in a specific molecule are connected, with each atom...
The structural formula gives the positions of the atoms and which atoms are bonded together, the molecular only gives you the figures. For example a compound could have the molecular formula C2H6O...
You might be able to do so in a few cases. If you take CH4 or O3, and know the bonds that those elements form, you'll see those can only be arranged one way. But if you take C4H10, this can be...