The empirical formula is just the simplest whole number ratio the molecular formula can be reduced to. For example C6H12 as a molecular formula can be reduced to CH2 as empirical by dividing both 6 and 12 by the lowest common factor which is 6.

Another example:

CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH… is C10H22, that can be reduced to C5H11 by dividing by 2.

Enjoy

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