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An open manometer attached to a flask containing ammonia gas have no difference in mercury level initially as shown in diagram. After sparking into the flask, ammonia is partially dissociated as 2 NH 3 g ⟶ N 2 g + 3 H 2 g . Now it have difference of 18 cm in mercury level in two columns, what is partial pressure of H 2 g at equilibrium ?

Options

  1. A9 cm of Hg
  2. B18 cm of Hg
  3. C27 cm of Hg
  4. DNone of these

Correct answer

C. 27 cm of Hg

Step-by-step solution

2 NH 3 g ⟶ N 2 g + 3 H 2 7 6 - 2 x x 3 x 7 6 + 2 x = 7 6 + 1 8 2 x = 1 8 ∴ x = 9 ∴ p H 2 = 3 × 9 = 27 cm of Hg

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