Combustion analysis is performed to determine__________________?
Correct answer: A. Empirical formula
- A. Empirical formula
- B. Molecular mass
- C. Molecular formula
- D. Formula mass
Explanation
Combustion analysis gives the relative amounts of carbon and hydrogen, and similar analysis can give other elemental ratios. Converting these ratios into the simplest whole-number ratio gives the empirical formula; a molecular mass is needed separately to obtain the molecular formula. The likely mistake is choosing c by confusing the empirical formula with the actual molecular formula.
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About Classification of Organic Compounds
Organic compounds are classified by carbon skeleton into open-chain, branched-chain and cyclic compounds, including homocyclic and heterocyclic types. The classification also uses functional groups to distinguish hydrocarbons, halo compounds, alcohols, aldehydes, ketones, carboxylic acids and their derivatives, which is different from naming compounds by IUPAC rules.
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