Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels.

Updated March 06, 2017

Definition:

Gram molecular mass is the mass in grams of one mole of a molecular substance.

Examples:

The molecular mass of N_{2} is 28, so the gram molecular mass of N_{2} is 28 g.