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Irma Ramos 2I
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Joined: Fri Sep 29, 2017 7:07 am


Postby Irma Ramos 2I » Thu Nov 09, 2017 9:33 am

How do we find the mass of atom given the molar mass of the element in order to use the de broglie equation??

Vivian Nguyen
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Joined: Fri Sep 29, 2017 7:04 am
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Postby Vivian Nguyen » Thu Nov 09, 2017 9:53 am

Is there a specific problem you can refer too? From the molar mass you can calculate the mass of an atom using Avogadros number. So you would take (molar mass/ 1 mol)× (1 mol/ 6.022x10^23 atoms) which would give you the mass per atom of that element.

Simply divide the molar mass by 6.022x10^23

Jessica Jones 2B
Posts: 80
Joined: Fri Sep 29, 2017 7:04 am


Postby Jessica Jones 2B » Thu Nov 09, 2017 10:03 am

When using the de broglie for an electron we use the known mass 9.11^-31 kg.
Remember to always use SI units when solving, which are kg.

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Postby Chem_Mod » Thu Nov 09, 2017 10:17 am

Great answers here.

You can also discuss this today (Thursday) in the many support hours I have organized:

Chemistry & Biochemistry, 4222 Young Hall
Victoria Ford 12-1 pm, Ronald Yang 12-1 pm, Karen Leung 1-2pm

STEM Learning Center, Boelter Science & Engineering Library 8251
Franklin Liu 2-4 pm

Five (physical) hours available today (Thursday), in addition to Chemistry Community.

Good luck with your midterm.

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