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I believe that rounding from 3.1 to 3 would be okay if you are solving for empirical formulas. If the number is about .1 away from a whole number, I don't believe that it would hurt to round it to a whole number. However, rounding to whole numbers in other problems besides solving for empirical/molecular formulas would not be the best move, since empirical formulas and molecular formulas deal with ratios of atoms, while other questions are asking for more exact numbers.
It also helps if you don't round at each intermediate step. Just plug it all into your calculator at once. If you do come across a number like 3.1, + or - .2 should be sufficient enough to round down or up.
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