difference between molecular mass and molar mass


by rubenhero
Tags: molar mass, mole concept, molecular mass
rubenhero
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#1
Dec3-11, 06:34 PM
P: 42
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!
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Borek
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Dec4-11, 02:49 AM
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Quote Quote by rubenhero View Post
molecular mass = mass of one molecule
Correct, but in what units?

molar mass = mass of one mole of a molecule
Correct, but in what units?

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.
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.
chikis
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Dec21-11, 10:14 AM
P: 235
Is molar mass not the same thing as mass of one mole of the substance in question?

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Dec21-11, 10:26 AM
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difference between molecular mass and molar mass


Quote Quote by chikis View Post
Is molar mass not the same thing as mass of one mole of the substance in question?
Yes it is.

But without using correct units you will be still off.
chikis
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#5
Dec21-11, 05:05 PM
P: 235
Quote Quote by Borek View Post
Yes it is.

But without using correct units you will be still off.
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?


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