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Enthalpy of sublimation of iodine is 24   c a l   g - 1 at   200 ° C . If specific heat of I 2 (s) and I 2 (vap) are 0.055 and 0.031   c a l   g - 1 K - 1 respectively, then enthalpy of sublimation of iodine at 250 ° C in c a l   g - 1 is:

Options

  1. A11.4
  2. B2.85
  3. C22.8
  4. D5.7

Correct answer

C. 22.8

Step-by-step solution

I 2 s → I 2 g Δ H 250 o C - Δ H 200 o C = Δ C p m T 2 - T 1 Δ H 250 o C - 24 = 0.013 - 0.055 × 50 Δ H 250 o C - 24 = - 1.2 ( Δ H ) 250 o C = 22.8   J / g m

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