The empirical formula exhibits the smallest whole-number ratio of atoms for a molecule
When the molecular formula already has the smallest whole-number ratio possible, then the empirical and molecular formulas will be the same. This is common for organic molecules that contain only carbon and hydrogen (i.e., hydrocarbons), where all bonds are single bonds (i.e., alkanes): CnH2n+2.
You may want to reference (Pages 91 - 92) Section 3.3 while completing this problem. Enter the empirical formula for the compounds represented by the molecular formulas.
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