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Question 55 of 66

Q.Which of the following compound has percentage of Carbon same as that in Ethylene (C2H4) ?

(a) Benzene
(b) Propene
(c) Ethane
(d) Ethyne
Tamil Nadu DgeTamil Nadu HSC First Year (DGE) Board 2023MCQ· 1mImportance★★★★★
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Percentage composition depends only on the empirical (simplest) formula; ethylene and propene share the empirical formula CH2, so both have the same %C (85.7%).

Ethylene, C2H4: molar mass = 2(12) + 4(1) = 28 g/mol. Mass of carbon = 24 g. %C = 24/28 x 100 = 85.71%.

Check each option:

  • Benzene, C6H6: molar mass = 78 g/mol, mass C = 72 g, %C = 72/78 x 100 = 92.3%.
  • Propene, C3H6: molar mass = 3(12) + 6(1) = 42 g/mol, mass C = 36 g, %C = 36/42 x 100 = 85.71%. -- matches ethylene.
  • Ethane, C2H6: molar mass = 30 g/mol, mass C = 24 g, %C = 24/30 x 100 = 80%. …
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