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BITSAT2020ChemistrySome Basic Concepts of ChemistryActual

An ideal gaseous mixture of ethane ( C ₂ H ₆ ) and ethene ( C ₂ H ₄ ) occupies 28 litre at 1 atm and 273 ~K . The mixture reacts completely with 128 ~g O ₂ to produce CO ₂ and H ₂ O . Mole fraction at C ₂ H ₆ in the mixture is:

Options

  1. A0.6
  2. B0.4
  3. C0.5
  4. D0.8

Correct answer

B. 0.4

Step-by-step solution

C ₂ H ₆+3.5 O ₂ 2 CO ₂+3 H ₂ O ; C ₂ H ₄+3 O ₂ 2 CO ₂+2 H ₂ O Let volume of ethane is x litre, 22.4 4=3.5 x +3(28- x ) x =11.2 litre at constant T and P , V n ; Mole fraction of C ₂ H ₆ in mixture = 11.2 28 =0.4

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