# Relation between molecular mass and molar mass

1. Dec 3, 2011

### rubenhero

1. The problem statement, all variables and given/known data

What is the difference between molecular mass and molar mass? Are they related?

2. Relevant equations

moles = total mass/ mass/mole

3. The attempt at a solution

I can't find any explanation in my lecture notes.
I think that:
molecular mass = mass of one molecule
molar mass = mass of one mole of a molecule

I think they are related by if i took the molecular mass and multiplied it by the number of moles, I would get the molar mass.
Any help explaining these concepts is appreciated!

2. Dec 4, 2011

### Staff: Mentor

Correct, but in what units?

Correct, but in what units?

I guess you mean "number of molecules in a mole", not "number of moles". You are not wrong, but you are still missing one important factor. Again, think about units used for both molar and molecular mass.

3. Dec 21, 2011

### chikis

Is molar mass not the same thing as mass of one mole of the substance in question?

4. Dec 21, 2011

### Staff: Mentor

Yes it is.

But without using correct units you will be still off.

5. Dec 21, 2011

### chikis

If that is the case the unit will be gram per mole i.e gmol-1. How about that?
Is relative molecular mass the same as molecular mass?