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Ammonia gas at 76 cm Hg pressure was con...

Ammonia gas at 76 cm Hg pressure was connected to a manometer. After sparking in the flask, ammonia is partially dissociated as follows :
`2NH_(3) (g) hArr N_(2) (g) + 3H_(2) (g)`
the level in the mercury column of the manometer was found to show the difference of 18 cm. What is the partial pressure of `H_(2) (g)` at equilibrium ?

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