Does a Molecule Have Weight?

The weight of  a molecule is measured by scientists on a relative scale. The weight of the molecule depends upon the weight of the atoms that form it. And the weight of the atom, in turn, depends upon the number of protons and neutrons in the nucleus of the atom.

A molecule of water is made up of two atoms of hydrogen plus one of oxygen. Hydrogen is a simple atoms with only one proton in the nucleus. Its atomic weight is 1. The weight of other elements is in multiples of the weight of hydrogen.


Oxygen has eight protons and eight neutrons, making an atomic weight of 16. So, water has a molecular weight of 2x1 plus 16, which makes its molecular weight 18. Molecules are held in their places in a solid or a liquid by the forces of attraction between molecules.

This attraction is of an electrical nature, and this force is strong enough to account for the strength of most solid materials.

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