What is the difference between molecular mass and formula mass?

No comments

In case of ionic compounds we have crystal lattice composed of ions. And there is a never ending pattern of ions and that made it difficult to calculate the molecular mass. Thus we used a simple method by taking the ratio of the ions and then adding their masses, like in case of NaCl ; 23 of Na + 35.5 of Cl = 58.8 amu formula mass of NaCl.

In case of molecular mass, that is simply taken in case of compounds that are confined to a limit as in case of CO2, we simply add the mass of Carbon 12+ 16×2 of oxygen = 44 amu is the molecular mass of CO2.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.