Periodic Table Sig Figs

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Michelle Wang 4I
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Joined: Fri Sep 28, 2018 12:27 am

Periodic Table Sig Figs

Postby Michelle Wang 4I » Tue Oct 02, 2018 1:19 am

Is there a particular number of sig figs that we should be using when looking at the periodic table? For example, should we use 16.00 or 15.999 as the atomic mass of oxygen? I know that the difference is slight but I'm just wondering.

Chem_Mod
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Re: Periodic Table Sig Figs

Postby Chem_Mod » Tue Oct 02, 2018 1:23 am

On any exams, a periodic table will be provided. Use whatever number is given on that periodic table.

janessadai 1F
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Re: Periodic Table Sig Figs

Postby janessadai 1F » Tue Oct 02, 2018 11:37 pm

But in that case, does the number of sig fig for the final answer depend on what is provided in the question or the number of sig fig in the periodic table?

Andrewwiner4D
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Joined: Fri Sep 28, 2018 12:28 am

Re: Periodic Table Sig Figs

Postby Andrewwiner4D » Wed Oct 03, 2018 10:59 am

I would wait to round till you get to the final answer. Use the extended version for calculations but then correct at the end for sig figs.

Ian Marquez 2K
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Re: Periodic Table Sig Figs

Postby Ian Marquez 2K » Wed Oct 03, 2018 12:24 pm

During the lecture today, Professor Lavelle stated that for computing and converting to moles or grams, just use the significant figures for the molar masses provided to you by the given periodic table. At the end of the problem, proceed to include the necessary significant figures. Basically, this all depends on the significant figures given by the periodic table at hand.


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