O Levels Chemistry (5070)•5070/11/M/J/24
Explanation
Molecular formulas differ for ethyne and benzene Steps:
- Identify molecular formula of ethyne as C₂H₂.
- Identify molecular formula of benzene as C₆H₆.
- Compare the two molecular formulas: C₂H₂ ≠ C₆H₆.
- Conclude that statement B accurately describes this difference.
Why B is correct:
- By definition, the molecular formula gives the exact atom composition of one molecule, so ethyne's C₂H₂ and benzene's C₆H₆ are distinct for these different compounds.
Why the others are wrong:
- A: Empirical formula is CH for both ethyne and benzene, differing from their respective molecular formulas C₂H₂ and C₆H₆.
- C: This is a general definition of empirical formula but does not address the specific formulae of ethyne and benzene.
- D: This is a general definition of molecular formula but does not address whether those of ethyne and benzene are the same or different.
Final answer: B
Topic: Formulae
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