molecular weight


molecular weight

Mass of a molecule of a substance, based on 12 as the atomic weight of carbon-12. It is calculated in practice by summing the atomic weights of the atoms making up the substance's molecular formula. The molecular weight of a hydrogen molecule (chemical formula H) is 2 (after rounding off); for many complex organic molecules (e.g., proteins, polymers) it may be in the millions.

Variants of MOLECULAR WEIGHT

molecular weight also called molecular mass

This entry comes from Encyclopædia Britannica Concise.
For the full entry on molecular weight, visit Britannica.com.

Seen & Heard

What made you look up molecular weight? Please tell us what you were reading, watching or discussing that led you here.

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More