Posted by shelly on Saturday, November 28, 2009 at 12:41pm.
Start by taking a 100 gram sample. That will give you
39.10 g C
8.77 g H
52.13 g O.
Convert each to moles. moles = grams/molar mass.
Then fin the ratio of each with small whole numbers. The easiest way to do that is to divide the smallest number of moles by itself. That will give you 1.00 for that element, then divide all of the other moles by that same small number. That will give you the empirical formula. To fin the molecular formula, find the empirical formula mass by adding the atomic masses of the elements. The molecular formula will be a multiple of that number. Post your work if you get stuck.
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