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AP EAMCET2016ChemistryThermodynamics (C)

Given that, aligned & C ( s )+ O ₂( ~g ) CO ₂( ~g ) ; H^ =-x ~kJ ~mol ⁻¹ & 2 CO ( g )+ O ₂( ~g ) 2 CO ₂( ~g ) ; H^ =-y ~kJ ~mol ⁻¹ aligned The enthalpy of formation of CO will be

Options

  1. Ay-2 x 3
  2. By-2 x 2
  3. C2 x-y 2
  4. Dx-y 2

Correct answer

B. y-2 x 2

Step-by-step solution

C ( s )+ O ₂( ~g ) CO ₂( ~g ) aligned & H ^ =-x ~kJ ~mol ⁻¹ & 2 CO ( g )+ O ₂( ~g ) 2 CO ₂( ~g ), & H ^ =-y ~kJ ~mol ⁻¹ aligned by applying eq. (i) - 1 2 Eq. (ii) aligned & C ( s )+ 1 2 O ₂ ~g CO ( g ) & f H ( CO )=-x- (- y 2 ) & =-x+ y 2 = y-2 x 2 aligned

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