Elemental Composition of Pure Substances

AP Chemistry· difficulty 3/5

A compound has empirical formula CH₂O and molar mass ~180 g/mol. Its molecular formula is

  • A

    C₃H₆O₃

  • B

    CH₂O

  • C

    C₆H₁₂O₆

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  • D

    C₂H₄O₂

Explanation

Empirical mass = 30 g/mol. 180/30 = 6 → multiply each subscript by 6: C₆H₁₂O₆ (e.g., glucose).

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