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Question 65

Which formula-and-count pair correctly completes the label for a methane molecule?

  1. C2H4, two carbon atoms
  2. CH3, three hydrogen atoms
  3. CH4, four hydrogen atomsCorrect answer
  4. C4H, four carbon atoms

Explanation

CH4 places a 4 after hydrogen, so one molecule contains one carbon atom and four hydrogen atoms. CH3 has only three hydrogen atoms, while C2H4 incorrectly doubles the carbon count.

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Question 65: Which formula-and-count pair correctly completes the label… · The Periodic Table and Elements · Questena