Molar Mass

Lily Smith 4C
Posts: 16
Joined: Fri Sep 28, 2018 12:27 am

Molar Mass

Where do you find the mass of an atom on the periodic table?

Alexandra Ortega 4D
Posts: 31
Joined: Wed Oct 03, 2018 12:17 am

Re: Molar Mass

The mass of an atom is usually listed under their chemical symbol in their specific box on the periodic table. The value is usually given to two decimal places. If you need the molar mass of an entire compound, you will need to calculate it using the molar masses of each individual atom and finding the sum.

Connie Chen 3D
Posts: 31
Joined: Mon Jan 08, 2018 8:12 am

Re: Molar Mass

Lily Smith wrote:Where do you find the mass of an atom on the periodic table?

I agree with the above post. To find molar mass for a singular atom, you find the atom on the periodic table and look below it. For example, Hydrogen (H) would have an molar mass of 1.0079 while Oxygen (O) would have an molar mass of 16.00. For molar mass of molecules, you add together all the singular atomic masses. For example, water (H2O) would have a molar mass of 18.0158 (16.00 + 1.0079 + 1.0079).

Lily Smith 4C
Posts: 16
Joined: Fri Sep 28, 2018 12:27 am

Re: Molar Mass

Oh, okay thank you for the help!

NatBrown1I
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

Re: Molar Mass

For the element carbon for example (which is pictured here) the number 6 represents the atomic number (the number of protons in the atom) and the number 12.011 is the atomic mass of an element, which is an average of the mass of all of the isotopes of that particular element.
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Posts: 33
Joined: Fri Sep 28, 2018 12:18 am

Re: Molar Mass

The units for molar mass are grams per mol.

MichelleTran 1I
Posts: 40
Joined: Fri Sep 28, 2018 12:23 am

Re: Molar Mass

Each element on the periodic table has their molar mass listed below the atomic symbol. The units are in g/mol!

SophiaKohlhoff4B
Posts: 30
Joined: Fri Sep 28, 2018 12:16 am

Re: Molar Mass

To find the mass of a molecule however, you need to take the molar mass, found under the atomic symbol on the periodic table, and divide by Avogadro's number, 6.022X10^23.

Jack Hewitt 2H
Posts: 67
Joined: Fri Sep 28, 2018 12:27 am

Re: Molar Mass

Lily Smith 4C wrote:Where do you find the mass of an atom on the periodic table?

It is listed under the element in their box on the periodic table.