### What is the notation for molar mass?

Posted:

**Fri Apr 06, 2018 2:42 pm**We know that the notation for mass is m, molar quantity is n. What is the notation for molar mass?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=8&t=30452

Page **1** of **1**

Posted: **Fri Apr 06, 2018 2:42 pm**

We know that the notation for mass is m, molar quantity is n. What is the notation for molar mass?

Posted: **Fri Apr 06, 2018 3:08 pm**

I believe the notation for molar mass is M

Posted: **Fri Apr 06, 2018 3:24 pm**

Molar Mass is expressed as a capital letter M and should not be confused with molarity. Dr. Lavelle underlines the M for molarity to distinguish the two. The units for molar mass are g/mol. Hope this helped! :)

Posted: **Fri Apr 06, 2018 3:28 pm**

That's correct. The notation for molar mass is M. However, the notation for molarity is also M, so when a question has M in it, be sure you know which M it's referring to. If the units for it is g/mol, then it's referring to molar mass, whereas if the units are in mol/L, then it's referring to molarity.

Posted: **Fri Apr 06, 2018 5:12 pm**

The unit for molar mass is M (g/mol).

Posted: **Thu Apr 12, 2018 9:26 am**

The notation for molar mass is a capital M, just remember to pay attention to the units the molar mass unit is (g/mol).

Posted: **Sun Apr 15, 2018 9:47 pm**

How do we distinguish between M for molar mass and M for molarity?

Posted: **Sun Apr 15, 2018 10:51 pm**

g/mol is mass, mole/liter is Molarity. They both are represented as 'M,' however when im doing my practice or hw problems i just write mass as 'mm.'

Posted: **Sun Apr 15, 2018 10:54 pm**

Molar Mass is expressed as "M"

Posted: **Sun Apr 15, 2018 11:12 pm**

If I'm not mistaken, molar mass is expressed as the capital letter M and the units are g/mol which is grams per mole.

Posted: **Sun Apr 29, 2018 10:53 pm**

Molar mass is expressed as M and the units are g/mol

Posted: **Sun Oct 07, 2018 10:00 pm**

Clarifying question, is g/mol the same as g.mol^-1 ?

Posted: **Sun Oct 07, 2018 10:11 pm**

I am pretty sure that it is just an uppercase M (g/mol).

Posted: **Mon Oct 08, 2018 10:13 am**

Yes molar mass is just a capital M which always expressed in the units g/mol. It is the mass of a substance (in grams) divided by its particular amount (in mols).

Posted: **Mon Oct 08, 2018 11:05 am**

Yes. To clarify, you are correct. g/mol is equivalent to writing g.mol^-1. The power of negative 1 refers to the fact that the g/mol has moles within the denominator.

Posted: **Tue Oct 09, 2018 3:56 pm**

in the textbook, it is grams/mol or g*mol^-1