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Question 72

Which entry correctly pairs ethanol with its formula and the total number of hydrogen atoms in one molecule?

  1. C2H5OH, six hydrogen atomsCorrect answer
  2. C2H5OH, five hydrogen atoms
  3. CH3OH, six hydrogen atoms
  4. C2H6, six hydrogen atoms

Explanation

C2H5OH contains five hydrogens in the H5 part and one more in the OH part, giving six in total. Counting only the first group misses the hydrogen attached to oxygen, while CH3OH is methanol rather than ethanol.

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Question 72: Which entry correctly pairs ethanol with its formula and… · The Periodic Table and Elements · Questena