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aligned & C ( s )+ O ₂( ~g ) CO ₂( ~g ) H=-94 kcal & 2 CO + O ₂( ~g ) 2 CO ₂( ~g ) H=-135.2 kcal aligned The heat of formation of CO ( g ) is :

Options

  1. A-26.4 kcal
  2. B41.2 kcal
  3. C26.4 kcal
  4. D229.2 kcal

Correct answer

A. -26.4 kcal

Step-by-step solution

The required reaction is aligned C ( s )+ 1 2 O ₂(g) & CO (g) CO ₂(g) & CO (g)+ 1 2 O ₂(g) aligned H= +135.2 2 kcal ...(i) aligned C ( s )+ O ₂( ~g ) & CO ₂( ~g ) aligned H =-94 kcal ...(ii) The required equation is come out by adding Eq. (i) and (ii) So, H_ f( CO ) =-94+ 135.2 2 =-26.4 kcal

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