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AIIMS2001ChemistryThermodynamics (C)

Given that C + O ₂ CO ₂ ; H^ =-a ~kJ . 2 CO + O ₂ 2 CO ₂ ; H^ =-b ~kJ The heat of formation of CO is

Options

  1. Ab-2 a
  2. B2 a-b 2
  3. Cb-2 a 2
  4. D2 a-b

Correct answer

C. b-2 a 2

Step-by-step solution

aligned & : C + O ₂ CO ₂ ; H^ =-a ~kJ & 2 CO + O ₂ 2 CO ₂ ; H^ =-b ~kJ aligned Formation of CO can be written as : C + 1 2 O ₂ CO ; H^ =? Adding equation: C + O ₂ CO ₂ ; H^ =-a ~kJ CO ₂ CO + 1 2 O ₂ ; H^ = b 2 ~kJ We get H_f^ ( CO )= b 2 -a= b-2 a 2

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