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Several times I have seen that, when you divide by the smallest molar mass when trying to find the empirical formula, the ratios are not always whole numbers. At what point is it too far to round to find the ratio?
If it is 0.8, I believe you would have to multiply all of the elements of the compound by 5 in order to find the empirical formula since that is the smallest number you can multiply by to get a whole number. Rounding 0.8 to 1 is a bit of a stretch even if you rounded in your work.
Usually you will intuitively know if the number is able to be rounded to a whole number or not. Usually my values that I round accurately to a whole number are within .05 of the whole number. If they are not whole numbers, in which it can happen, write the empirical formula down with the decimal subscript and find a number to multiple it by so you can get a whole number. Then multiply the other subscripts by this number as well.
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