Register to reply

Difference between molecular mass and molar mass

by rubenhero
Tags: molar mass, mole concept, molecular mass
Share this thread:
rubenhero
#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!
Phys.Org News Partner Science news on Phys.org
Experts defend operational earthquake forecasting, counter critiques
EU urged to convert TV frequencies to mobile broadband
Sierra Nevada freshwater runoff could drop 26 percent by 2100
Borek
#2
Dec4-11, 02:49 AM
Admin
Borek's Avatar
P: 23,597
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
#3
Dec21-11, 10:14 AM
P: 235
Is molar mass not the same thing as mass of one mole of the substance in question?

Borek
#4
Dec21-11, 10:26 AM
Admin
Borek's Avatar
P: 23,597
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
#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?


Register to reply

Related Discussions
Mass times avogadro's numbers = molar mass ? Biology, Chemistry & Other Homework 2
Molar mass, atm, pressure, find mass. HELP Introductory Physics Homework 13
Atomic mass unit and Molar mass Chemistry 10
Molar mass to molecular formula Biology, Chemistry & Other Homework 17
How to find the molecular formula out of the molar mass? Biology, Chemistry & Other Homework 2