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So in this situation I believe you should do at least four significant figures just to be safe. At lease that is what I did. But as long as the mass percentages added up to 100% I believe you will be fine.
I think for emperial and molecular formula it doesn't really matter. I would take as many as possible( like 5-6 sig figs) cause in order to get a more accurate ratio, the more accurate your numbers are, the more accurate your ratio between moles will be.
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