Molar Mass

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Giselle Garcia 1B
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Joined: Wed Sep 21, 2016 2:58 pm

Molar Mass

Postby Giselle Garcia 1B » Sun Jul 02, 2017 10:08 pm

What's the difference between Molar Mass and Molecular Weight? Are the two terms used loosely?

Jennah Muhammad 1H
Posts: 16
Joined: Sat Jul 09, 2016 3:00 am

Re: Molar Mass

Postby Jennah Muhammad 1H » Sun Jul 02, 2017 10:13 pm

from what I know the molecular weight and molar mass have the same numbers but have different units. The molecular weight is in amu and the molar mass is in grams per mole...im not sure how to explain in detail the reasoning behind this, I hope someone else is able to.

404768057
Posts: 20
Joined: Fri Jul 22, 2016 3:00 am

Re: Molar Mass

Postby 404768057 » Sat Jul 08, 2017 11:20 pm

I think molecular weight and molar mass have different units because molecular weight comes from the total amount of the atomic mass in a molecule and molar mass is the amount of mass per mole of a molecule.

Natalie Espadas 1A
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Joined: Wed Nov 16, 2016 3:03 am

Re: Molar Mass

Postby Natalie Espadas 1A » Sun Jul 09, 2017 8:37 pm

I confuse these two terms along with Molarity (M). Is there any way you guys distinguish these terms? Thank you in advance!

aless_wu
Posts: 5
Joined: Fri Jun 23, 2017 11:39 am

Re: Molar Mass

Postby aless_wu » Mon Jul 10, 2017 6:14 pm

If i'm not mistaken, molar mass is just grams per mole while molarity is number of particles in a liter (moles per liter). And then as for the molar weight vs. molar mass, it is the same value just different units like said above :)

Austin Ho 1E
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Re: Molar Mass

Postby Austin Ho 1E » Mon Oct 02, 2017 7:28 pm

Whenever I think about molar mass I always remember that molar mass is how many grams 1 mole of that substance would be. I.e., 1 mole of Carbon-12 is 12.01 grams.

Molecular weight is essentially the same thing as molar mass (as mentioned above) but instead uses amu.

All that really matters is that you look at the context of the question to understand what's being asked, and you'll figure it out. You can always use Dr. Lavelle's problem solving method as well!

Hope this helps :)

Mikaila 3E
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Joined: Fri Sep 29, 2017 7:07 am

Re: Molar Mass

Postby Mikaila 3E » Thu Oct 05, 2017 4:54 pm

Natalie Espadas 1A wrote:I confuse these two terms along with Molarity (M). Is there any way you guys distinguish these terms? Thank you in advance!

Molar mass is the mass per mole.
Molecular weight is different considering that it is a weight and not a mass. It's measurement is based on the gravitational pull.
Molarity is moles per liter or (moles of solute [n])/(volume of solution [v]).

Alondra Juarez section 1E
Posts: 47
Joined: Fri Sep 29, 2017 7:03 am

Re: Molar Mass

Postby Alondra Juarez section 1E » Thu Oct 05, 2017 5:33 pm

What kind of helps me remember the difference between molar mass and molecular weight is the molar mass is what the entire compound equals for example H20 would have a molar mass of 17.01 while the weight of lets say hydrogen would only be 1.01.


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