Atom of a chemical element, Chemistry

The atomic weight is the weight of an atom of a chemical element.  For instance, the atomic weight of oxygen is 15.9994 and the atomic weight of hydrogen is 1.0079.  Write a script that will determine the molecular weight of hydrogen peroxide, which having of two atoms of hydrogen and two atoms of oxygen.  Contain comments in the script.  Use help to view the comment in your script.

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