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aligned & S ( ~g )+ 3 2 O ₂( ~g ) SO ₃( ~g )+2 x kcal & SO ₂( ~g )+ 1 2 O ₂( ~g ) SO ₃( ~g )+y kcal aligned The heat of formation of SO ₂( ~g ) is given by :

Options

  1. Ax+y kcal
  2. By-2 x kcal
  3. C2 x y kcal
  4. D2 x+y kcal

Correct answer

B. y-2 x kcal

Step-by-step solution

(i) S ( g )+ 3 2 O ₂( ~g ) SO ₃( ~g )+2 x kcal H ₁ (ii) SO ₂( ~g )+ 1 2 O ₂( ~g ) SO ₃( ~g )+y kcal H ₂ (i) - (ii) aligned & S ( ~g )+ O ₂( ~g ) SO ₂( ~g ) H & H = H ₁- H ₂ & =-2 x-(-y)=(y-2 x) kcal aligned

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