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JEE Main2012ChemistryThermodynamics (C)Actual

The electron affinity of chlorine is 3.7 eV .1 gram of chlorine is completely converted to Cl ⁻ ion in a gaseous state. (1 eV =23.06 kcal mol ⁻¹ ) . Energy released in the process is

Options

  1. A4.8 kcal
  2. B7.2 kcal
  3. C8.2 kcal
  4. D2.4 kcal

Correct answer

D. 2.4 kcal

Step-by-step solution

Number of moles = 1 35.5 Given, 1 eV =23.06 kcal mol ⁻¹3.7 eV =3.7 23.06 kcal mol ⁻¹ i.e. 1 mole realease energy =3.7 23.06 kcal Energy released = 1 35.5 3.7 23.06 kcal =2.4 kcal

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