Correct Answer: Option C

Explanation

The empirical formula is the simplest whole number ratio of the number of atoms of each element in a substance. In the case of ethanoic acid, the ratio of atoms is 1:2:1, as shown by the empirical formula CH\(_2\)O.

The molecular formula for ethanoic acid is C\(_2\)H\(_4\)O\(_2\).

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