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MHT CET20255 May 2025Evening ShiftChemistryGeneral Organic ChemistryActual

What is the number of moles of ' C ' and ' H ' atoms respectively present in n mole molecule represented by following structure ?

Options

  1. A6n and 6n
  2. B6n and 8n
  3. C8n and 8n
  4. D7n and 9n

Correct answer

C. 8n and 8n

Step-by-step solution

The molecular structure of styrene consists of a benzene ring bonded to a vinyl group. A benzene ring attached as a substituent contributes 6 carbon atoms and 5 hydrogen atoms, while the vinyl group -CH=CH₂ contributes 2 carbon atoms and 3 hydrogen atoms. Total carbon atoms: 6 + 2 = 8 Total hydrogen atoms: 5 + 3 = 8 The molecular formula is C8H8 . For n moles of styrene molecules, the number of moles of carbon atoms is 8 n = 8n , and the number of moles of hydrogen atoms is 8 n = 8n . Final answer: C

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