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2 Z n + O 2 → 2 Z n O ; Δ G ° = - 616 J 2 Z n + S 2 → 2 Z n S ; Δ G ° = - 293 J S 2 + 2 O 2 → 2 S O 2 ; Δ G ° = - 408 J Δ G ° for the following reaction 2 Z n S + 3 O 2 → 2 Z n O + 2 S O 2 is

Options

  1. A- 731 J
  2. B- 1317 J
  3. C- 501 J
  4. D+ 731 J

Correct answer

A. - 731 J

Step-by-step solution

For the reactions, 2 Z n S → 2 Z n + S 2 ; Δ G ° = + 293 J ...(i) 2 Z n + O 2 → 2 Z n O ; Δ G ° = - 616 J ...(ii) S 2 + 2 O 2 → 2 S O 2 ; Δ G ° = - 408 J ...(iii) The Δ G ° for the reaction, 2 Z n S + 3 O 2 → 2 Z n O + 2 S O 2 can be obtained by adding equations. (i), (ii) and (iii) So, Δ G ° = 293 - 616 - 408 = - 731 J

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