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I noticed when Prof. Lavelle is calculating molar mass of compounds (or anything involving math), he writes the mass of O as 16 g.mol-1, but H stays 1.008 g.mol-1. Is there a guideline we should follow when rounding atomic masses?
In the test we will be given a periodic table and I would assume that we are meant to use whatever version of the atomic mass that the table specifies :)
Yeah I would say always use the maximum number of digits given to you in the question or periodic table on the assessment, and then round according to significant figures only at the very end of the problem.
Personally, I just follow the periodic table, no matter how tedious it may be to spell out the entire number, just to be safe. You could just save the rounding for the end, while also attaching a solution that isn't rounded possibly.
I also struggled with different periodic tables having different values present, but I just asked my TA if I could keep the periodic table from the quiz week 2 and have been using that one and it corresponds well.
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